Finding the Fourth Proportional to 156,379.38, 215,910.27 and 99,867.30

Step by Step Solution

1. Step 1: Write the proportion equation
   156,379.38 : 215,910.27 = 99,867.30 : x
2. Step 2: Convert to fraction form
   156,379.38/215,910.27 = 99,867.30/x
3. Step 3: Cross multiply
   156,379.38x = 215,910.27 × 99,867.30
4. Step 4: Simplify right side
   156,379.38x = 21,562,375,707.17
5. Step 5: Solve for x
   x = 21,562,375,707.17/156,379.38
6. Step 6: Final answer
   x = 137,885.03