Finding the Fourth Proportional to 287,978.14, 397,400.54 and 157,150.78

Step by Step Solution

1. Step 1: Write the proportion equation
   287,978.14 : 397,400.54 = 157,150.78 : x
2. Step 2: Convert to fraction form
   287,978.14/397,400.54 = 157,150.78/x
3. Step 3: Cross multiply
   287,978.14x = 397,400.54 × 157,150.78
4. Step 4: Simplify right side
   287,978.14x = 62,451,804,833.42
5. Step 5: Solve for x
   x = 62,451,804,833.42/287,978.14
6. Step 6: Final answer
   x = 216,863.01