Finding the Fourth Proportional to 99,641.89, 149,498.48 and 42,691.87

Step by Step Solution

1. Step 1: Write the proportion equation
   99,641.89 : 149,498.48 = 42,691.87 : x
2. Step 2: Convert to fraction form
   99,641.89/149,498.48 = 42,691.87/x
3. Step 3: Cross multiply
   99,641.89x = 149,498.48 × 42,691.87
4. Step 4: Simplify right side
   99,641.89x = 6,382,369,966.96
5. Step 5: Solve for x
   x = 6,382,369,966.96/99,641.89
6. Step 6: Final answer
   x = 64,053.08