Finding the Third Proportional to 13,201,821 and 21,006,688.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,201,821 : 21,006,688.50 = 21,006,688.50 : x
2. Step 2: Convert to fraction form
   13,201,821/21,006,688.50 = 21,006,688.50/x
3. Step 3: Cross multiply
   13,201,821x = 21,006,688.50 × 21,006,688.50
4. Step 4: Simplify right side
   13,201,821x = 441,280,961,736,032.25
5. Step 5: Solve for x
   x = 441,280,961,736,032.25/13,201,821
6. Step 6: Final answer
   x = 33,425,764.65