Finding the Third Proportional to 128,865,831,122.50 and 261,406,111,751

Step by Step Solution

1. Step 1: Write the proportion equation
   128,865,831,122.50 : 261,406,111,751 = 261,406,111,751 : x
2. Step 2: Convert to fraction form
   128,865,831,122.50/261,406,111,751 = 261,406,111,751/x
3. Step 3: Cross multiply
   128,865,831,122.50x = 261,406,111,751 × 261,406,111,751
4. Step 4: Simplify right side
   128,865,831,122.50x = 68,333,155,260,776,300,150,784
5. Step 5: Solve for x
   x = 68,333,155,260,776,300,150,784/128,865,831,122.50
6. Step 6: Final answer
   x = 530,265,894,888.92