Finding the Fourth Proportional to 7,043.31, 9,709.61 and 5,631.21

Step by Step Solution

1. Step 1: Write the proportion equation
   7,043.31 : 9,709.61 = 5,631.21 : x
2. Step 2: Convert to fraction form
   7,043.31/9,709.61 = 5,631.21/x
3. Step 3: Cross multiply
   7,043.31x = 9,709.61 × 5,631.21
4. Step 4: Simplify right side
   7,043.31x = 54,676,824.77
5. Step 5: Solve for x
   x = 54,676,824.77/7,043.31
6. Step 6: Final answer
   x = 7,762.94