Finding the Fourth Proportional to 111,990.38, 154,546.72 and 61,689.38

Step by Step Solution

1. Step 1: Write the proportion equation
   111,990.38 : 154,546.72 = 61,689.38 : x
2. Step 2: Convert to fraction form
   111,990.38/154,546.72 = 61,689.38/x
3. Step 3: Cross multiply
   111,990.38x = 154,546.72 × 61,689.38
4. Step 4: Simplify right side
   111,990.38x = 9,533,891,337.83
5. Step 5: Solve for x
   x = 9,533,891,337.83/111,990.38
6. Step 6: Final answer
   x = 85,131.34