Finding the Fourth Proportional to 356,081.64, 491,725.76 and 228,978.04

Step by Step Solution

1. Step 1: Write the proportion equation
   356,081.64 : 491,725.76 = 228,978.04 : x
2. Step 2: Convert to fraction form
   356,081.64/491,725.76 = 228,978.04/x
3. Step 3: Cross multiply
   356,081.64x = 491,725.76 × 228,978.04
4. Step 4: Simplify right side
   356,081.64x = 112,594,400,742.31
5. Step 5: Solve for x
   x = 112,594,400,742.31/356,081.64
6. Step 6: Final answer
   x = 316,203.89