Finding the Fourth Proportional to 99,641.61, 149,498.06 and 42,691.59

Step by Step Solution

1. Step 1: Write the proportion equation
   99,641.61 : 149,498.06 = 42,691.59 : x
2. Step 2: Convert to fraction form
   99,641.61/149,498.06 = 42,691.59/x
3. Step 3: Cross multiply
   99,641.61x = 149,498.06 × 42,691.59
4. Step 4: Simplify right side
   99,641.61x = 6,382,309,669.86
5. Step 5: Solve for x
   x = 6,382,309,669.86/99,641.61
6. Step 6: Final answer
   x = 64,052.66