Finding the Fourth Proportional to 5,630.88, 8,443.29 and 3,990.63

Step by Step Solution

1. Step 1: Write the proportion equation
   5,630.88 : 8,443.29 = 3,990.63 : x
2. Step 2: Convert to fraction form
   5,630.88/8,443.29 = 3,990.63/x
3. Step 3: Cross multiply
   5,630.88x = 8,443.29 × 3,990.63
4. Step 4: Simplify right side
   5,630.88x = 33,694,046.37
5. Step 5: Solve for x
   x = 33,694,046.37/5,630.88
6. Step 6: Final answer
   x = 5,983.80