Finding the Fourth Proportional to 9,385.80, 12,954.71 and 5,611.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,385.80 : 12,954.71 = 5,611.20 : x
2. Step 2: Convert to fraction form
   9,385.80/12,954.71 = 5,611.20/x
3. Step 3: Cross multiply
   9,385.80x = 12,954.71 × 5,611.20
4. Step 4: Simplify right side
   9,385.80x = 72,691,468.75
5. Step 5: Solve for x
   x = 72,691,468.75/9,385.80
6. Step 6: Final answer
   x = 7,744.83