Finding the Third Proportional to 342,478.50 and 545,428

Step by Step Solution

1. Step 1: Write the proportion equation
   342,478.50 : 545,428 = 545,428 : x
2. Step 2: Convert to fraction form
   342,478.50/545,428 = 545,428/x
3. Step 3: Cross multiply
   342,478.50x = 545,428 × 545,428
4. Step 4: Simplify right side
   342,478.50x = 297,491,703,184
5. Step 5: Solve for x
   x = 297,491,703,184/342,478.50
6. Step 6: Final answer
   x = 868,643.44