Finding the Third Proportional to 515,430 and 757,687.50

Step by Step Solution

1. Step 1: Write the proportion equation
   515,430 : 757,687.50 = 757,687.50 : x
2. Step 2: Convert to fraction form
   515,430/757,687.50 = 757,687.50/x
3. Step 3: Cross multiply
   515,430x = 757,687.50 × 757,687.50
4. Step 4: Simplify right side
   515,430x = 574,090,347,656.25
5. Step 5: Solve for x
   x = 574,090,347,656.25/515,430
6. Step 6: Final answer
   x = 1,113,808.56