Finding the Fourth Proportional to 9,388.58, 12,957.17 and 5,611.21

Step by Step Solution

1. Step 1: Write the proportion equation
   9,388.58 : 12,957.17 = 5,611.21 : x
2. Step 2: Convert to fraction form
   9,388.58/12,957.17 = 5,611.21/x
3. Step 3: Cross multiply
   9,388.58x = 12,957.17 × 5,611.21
4. Step 4: Simplify right side
   9,388.58x = 72,705,341.43
5. Step 5: Solve for x
   x = 72,705,341.43/9,388.58
6. Step 6: Final answer
   x = 7,744.02