Finding the Fourth Proportional to 9,641.76, 14,445.12 and 8,091.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,641.76 : 14,445.12 = 8,091.72 : x
2. Step 2: Convert to fraction form
   9,641.76/14,445.12 = 8,091.72/x
3. Step 3: Cross multiply
   9,641.76x = 14,445.12 × 8,091.72
4. Step 4: Simplify right side
   9,641.76x = 116,885,866.41
5. Step 5: Solve for x
   x = 116,885,866.41/9,641.76
6. Step 6: Final answer
   x = 12,122.88