Finding the Third Proportional to 342,387 and 514,615.50

Step by Step Solution

1. Step 1: Write the proportion equation
   342,387 : 514,615.50 = 514,615.50 : x
2. Step 2: Convert to fraction form
   342,387/514,615.50 = 514,615.50/x
3. Step 3: Cross multiply
   342,387x = 514,615.50 × 514,615.50
4. Step 4: Simplify right side
   342,387x = 264,829,112,840.25
5. Step 5: Solve for x
   x = 264,829,112,840.25/342,387
6. Step 6: Final answer
   x = 773,478.88