Finding the Fourth Proportional to 42,891.61, 59,211.33 and 28,559.91

Step by Step Solution

1. Step 1: Write the proportion equation
   42,891.61 : 59,211.33 = 28,559.91 : x
2. Step 2: Convert to fraction form
   42,891.61/59,211.33 = 28,559.91/x
3. Step 3: Cross multiply
   42,891.61x = 59,211.33 × 28,559.91
4. Step 4: Simplify right side
   42,891.61x = 1,691,070,255.78
5. Step 5: Solve for x
   x = 1,691,070,255.78/42,891.61
6. Step 6: Final answer
   x = 39,426.60