Finding the Fourth Proportional to 1,047.31, 1,558.99 and 1,031.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,047.31 : 1,558.99 = 1,031.74 : x
2. Step 2: Convert to fraction form
   1,047.31/1,558.99 = 1,031.74/x
3. Step 3: Cross multiply
   1,047.31x = 1,558.99 × 1,031.74
4. Step 4: Simplify right side
   1,047.31x = 1,608,472.34
5. Step 5: Solve for x
   x = 1,608,472.34/1,047.31
6. Step 6: Final answer
   x = 1,535.81