Finding the Fourth Proportional to 165,836.50, 228,854.16 and 90,385

Step by Step Solution

1. Step 1: Write the proportion equation
   165,836.50 : 228,854.16 = 90,385 : x
2. Step 2: Convert to fraction form
   165,836.50/228,854.16 = 90,385/x
3. Step 3: Cross multiply
   165,836.50x = 228,854.16 × 90,385
4. Step 4: Simplify right side
   165,836.50x = 20,684,983,251.60
5. Step 5: Solve for x
   x = 20,684,983,251.60/165,836.50
6. Step 6: Final answer
   x = 124,731.19