Finding the Third Proportional to 431,978.50 and 608,055

Step by Step Solution

1. Step 1: Write the proportion equation
   431,978.50 : 608,055 = 608,055 : x
2. Step 2: Convert to fraction form
   431,978.50/608,055 = 608,055/x
3. Step 3: Cross multiply
   431,978.50x = 608,055 × 608,055
4. Step 4: Simplify right side
   431,978.50x = 369,730,883,025
5. Step 5: Solve for x
   x = 369,730,883,025/431,978.50
6. Step 6: Final answer
   x = 855,901.12