Finding the Fourth Proportional to 8,890.71, 12,271.55 and 5,531.61

Step by Step Solution

1. Step 1: Write the proportion equation
   8,890.71 : 12,271.55 = 5,531.61 : x
2. Step 2: Convert to fraction form
   8,890.71/12,271.55 = 5,531.61/x
3. Step 3: Cross multiply
   8,890.71x = 12,271.55 × 5,531.61
4. Step 4: Simplify right side
   8,890.71x = 67,881,428.70
5. Step 5: Solve for x
   x = 67,881,428.70/8,890.71
6. Step 6: Final answer
   x = 7,635.10