Finding the Third Proportional to 431,981.50 and 608,059.50

Step by Step Solution

1. Step 1: Write the proportion equation
   431,981.50 : 608,059.50 = 608,059.50 : x
2. Step 2: Convert to fraction form
   431,981.50/608,059.50 = 608,059.50/x
3. Step 3: Cross multiply
   431,981.50x = 608,059.50 × 608,059.50
4. Step 4: Simplify right side
   431,981.50x = 369,736,355,540.25
5. Step 5: Solve for x
   x = 369,736,355,540.25/431,981.50
6. Step 6: Final answer
   x = 855,907.85