Finding the Fourth Proportional to 28,116.55, 42,159.34 and 9,386.72

Step by Step Solution

1. Step 1: Write the proportion equation
   28,116.55 : 42,159.34 = 9,386.72 : x
2. Step 2: Convert to fraction form
   28,116.55/42,159.34 = 9,386.72/x
3. Step 3: Cross multiply
   28,116.55x = 42,159.34 × 9,386.72
4. Step 4: Simplify right side
   28,116.55x = 395,737,826.20
5. Step 5: Solve for x
   x = 395,737,826.20/28,116.55
6. Step 6: Final answer
   x = 14,074.91