Finding the Fourth Proportional to 207,978.60, 287,010.78 and 112,485.24

Step by Step Solution

1. Step 1: Write the proportion equation
   207,978.60 : 287,010.78 = 112,485.24 : x
2. Step 2: Convert to fraction form
   207,978.60/287,010.78 = 112,485.24/x
3. Step 3: Cross multiply
   207,978.60x = 287,010.78 × 112,485.24
4. Step 4: Simplify right side
   207,978.60x = 32,284,476,470.89
5. Step 5: Solve for x
   x = 32,284,476,470.89/207,978.60
6. Step 6: Final answer
   x = 155,229.80