Finding the Third Proportional to 357,042.50 and 521,880.50

Step by Step Solution

1. Step 1: Write the proportion equation
   357,042.50 : 521,880.50 = 521,880.50 : x
2. Step 2: Convert to fraction form
   357,042.50/521,880.50 = 521,880.50/x
3. Step 3: Cross multiply
   357,042.50x = 521,880.50 × 521,880.50
4. Step 4: Simplify right side
   357,042.50x = 272,359,256,280.25
5. Step 5: Solve for x
   x = 272,359,256,280.25/357,042.50
6. Step 6: Final answer
   x = 762,820.27