Finding the Fourth Proportional to 8,990.43, 12,398.71 and 5,633.60

Step by Step Solution

1. Step 1: Write the proportion equation
   8,990.43 : 12,398.71 = 5,633.60 : x
2. Step 2: Convert to fraction form
   8,990.43/12,398.71 = 5,633.60/x
3. Step 3: Cross multiply
   8,990.43x = 12,398.71 × 5,633.60
4. Step 4: Simplify right side
   8,990.43x = 69,849,372.66
5. Step 5: Solve for x
   x = 69,849,372.66/8,990.43
6. Step 6: Final answer
   x = 7,769.30