Finding the Third Proportional to 257,121 and 558,466.50

Step by Step Solution

1. Step 1: Write the proportion equation
   257,121 : 558,466.50 = 558,466.50 : x
2. Step 2: Convert to fraction form
   257,121/558,466.50 = 558,466.50/x
3. Step 3: Cross multiply
   257,121x = 558,466.50 × 558,466.50
4. Step 4: Simplify right side
   257,121x = 311,884,831,622.25
5. Step 5: Solve for x
   x = 311,884,831,622.25/257,121
6. Step 6: Final answer
   x = 1,212,988.56