Finding the Fourth Proportional to 279,830.64, 386,167.61 and 158,978.56

Step by Step Solution

1. Step 1: Write the proportion equation
   279,830.64 : 386,167.61 = 158,978.56 : x
2. Step 2: Convert to fraction form
   279,830.64/386,167.61 = 158,978.56/x
3. Step 3: Cross multiply
   279,830.64x = 386,167.61 × 158,978.56
4. Step 4: Simplify right side
   279,830.64x = 61,392,367,830.71
5. Step 5: Solve for x
   x = 61,392,367,830.71/279,830.64
6. Step 6: Final answer
   x = 219,391.16