Finding the Fourth Proportional to 8,989.85, 12,407.61 and 5,635.58

Step by Step Solution

1. Step 1: Write the proportion equation
   8,989.85 : 12,407.61 = 5,635.58 : x
2. Step 2: Convert to fraction form
   8,989.85/12,407.61 = 5,635.58/x
3. Step 3: Cross multiply
   8,989.85x = 12,407.61 × 5,635.58
4. Step 4: Simplify right side
   8,989.85x = 69,924,037.86
5. Step 5: Solve for x
   x = 69,924,037.86/8,989.85
6. Step 6: Final answer
   x = 7,778.11