Finding the Third Proportional to 515,938.50 and 743,139

Step by Step Solution

1. Step 1: Write the proportion equation
   515,938.50 : 743,139 = 743,139 : x
2. Step 2: Convert to fraction form
   515,938.50/743,139 = 743,139/x
3. Step 3: Cross multiply
   515,938.50x = 743,139 × 743,139
4. Step 4: Simplify right side
   515,938.50x = 552,255,573,321
5. Step 5: Solve for x
   x = 552,255,573,321/515,938.50
6. Step 6: Final answer
   x = 1,070,390.31