Finding the Fourth Proportional to 5,631.31, 8,447.72 and 5,320.42

Step by Step Solution

1. Step 1: Write the proportion equation
   5,631.31 : 8,447.72 = 5,320.42 : x
2. Step 2: Convert to fraction form
   5,631.31/8,447.72 = 5,320.42/x
3. Step 3: Cross multiply
   5,631.31x = 8,447.72 × 5,320.42
4. Step 4: Simplify right side
   5,631.31x = 44,945,418.44
5. Step 5: Solve for x
   x = 44,945,418.44/5,631.31
6. Step 6: Final answer
   x = 7,981.34