Finding the Third Proportional to 306,542.50 and 478,440

Step by Step Solution

1. Step 1: Write the proportion equation
   306,542.50 : 478,440 = 478,440 : x
2. Step 2: Convert to fraction form
   306,542.50/478,440 = 478,440/x
3. Step 3: Cross multiply
   306,542.50x = 478,440 × 478,440
4. Step 4: Simplify right side
   306,542.50x = 228,904,833,600
5. Step 5: Solve for x
   x = 228,904,833,600/306,542.50
6. Step 6: Final answer
   x = 746,731.15