Finding the Fourth Proportional to 111,139.16, 153,443.58 and 99,181.96

Step by Step Solution

1. Step 1: Write the proportion equation
   111,139.16 : 153,443.58 = 99,181.96 : x
2. Step 2: Convert to fraction form
   111,139.16/153,443.58 = 99,181.96/x
3. Step 3: Cross multiply
   111,139.16x = 153,443.58 × 99,181.96
4. Step 4: Simplify right side
   111,139.16x = 15,218,835,013.82
5. Step 5: Solve for x
   x = 15,218,835,013.82/111,139.16
6. Step 6: Final answer
   x = 136,934.95