Finding the Fourth Proportional to 5,009.31, 7,515.72 and 2,931.12

Step by Step Solution

1. Step 1: Write the proportion equation
   5,009.31 : 7,515.72 = 2,931.12 : x
2. Step 2: Convert to fraction form
   5,009.31/7,515.72 = 2,931.12/x
3. Step 3: Cross multiply
   5,009.31x = 7,515.72 × 2,931.12
4. Step 4: Simplify right side
   5,009.31x = 22,029,477.21
5. Step 5: Solve for x
   x = 22,029,477.21/5,009.31
6. Step 6: Final answer
   x = 4,397.71