Finding the Fourth Proportional to 143,836.72, 198,490.08 and 90,150.72

Step by Step Solution

1. Step 1: Write the proportion equation
   143,836.72 : 198,490.08 = 90,150.72 : x
2. Step 2: Convert to fraction form
   143,836.72/198,490.08 = 90,150.72/x
3. Step 3: Cross multiply
   143,836.72x = 198,490.08 × 90,150.72
4. Step 4: Simplify right side
   143,836.72x = 17,894,023,624.86
5. Step 5: Solve for x
   x = 17,894,023,624.86/143,836.72
6. Step 6: Final answer
   x = 124,405.11