Finding the Fourth Proportional to 119,128.86, 163,875.42 and 99,642.96

Step by Step Solution

1. Step 1: Write the proportion equation
   119,128.86 : 163,875.42 = 99,642.96 : x
2. Step 2: Convert to fraction form
   119,128.86/163,875.42 = 99,642.96/x
3. Step 3: Cross multiply
   119,128.86x = 163,875.42 × 99,642.96
4. Step 4: Simplify right side
   119,128.86x = 16,329,031,920.04
5. Step 5: Solve for x
   x = 16,329,031,920.04/119,128.86
6. Step 6: Final answer
   x = 137,070.33