Finding the Fourth Proportional to 3,687.31, 5,088.43 and 2,031.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,687.31 : 5,088.43 = 2,031.31 : x
2. Step 2: Convert to fraction form
   3,687.31/5,088.43 = 2,031.31/x
3. Step 3: Cross multiply
   3,687.31x = 5,088.43 × 2,031.31
4. Step 4: Simplify right side
   3,687.31x = 10,336,178.74
5. Step 5: Solve for x
   x = 10,336,178.74/3,687.31
6. Step 6: Final answer
   x = 2,803.18