Finding the Fourth Proportional to 2,591.40, 3,888.68 and 1,031.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,591.40 : 3,888.68 = 1,031.12 : x
2. Step 2: Convert to fraction form
   2,591.40/3,888.68 = 1,031.12/x
3. Step 3: Cross multiply
   2,591.40x = 3,888.68 × 1,031.12
4. Step 4: Simplify right side
   2,591.40x = 4,009,695.72
5. Step 5: Solve for x
   x = 4,009,695.72/2,591.40
6. Step 6: Final answer
   x = 1,547.31