Finding the Fourth Proportional to 287,766.56, 431,280.42 and 137,782.10

Step by Step Solution

1. Step 1: Write the proportion equation
   287,766.56 : 431,280.42 = 137,782.10 : x
2. Step 2: Convert to fraction form
   287,766.56/431,280.42 = 137,782.10/x
3. Step 3: Cross multiply
   287,766.56x = 431,280.42 × 137,782.10
4. Step 4: Simplify right side
   287,766.56x = 59,422,719,800.08
5. Step 5: Solve for x
   x = 59,422,719,800.08/287,766.56
6. Step 6: Final answer
   x = 206,496.27