Finding the Fourth Proportional to 99,668.38, 137,540.61 and 54,346.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99,668.38 : 137,540.61 = 54,346.72 : x
2. Step 2: Convert to fraction form
   99,668.38/137,540.61 = 54,346.72/x
3. Step 3: Cross multiply
   99,668.38x = 137,540.61 × 54,346.72
4. Step 4: Simplify right side
   99,668.38x = 7,474,881,020.30
5. Step 5: Solve for x
   x = 7,474,881,020.30/99,668.38
6. Step 6: Final answer
   x = 74,997.52