Finding the Fourth Proportional to 1,113.35, 1,661.90 and 1,031.00

Step by Step Solution

1. Step 1: Write the proportion equation
   1,113.35 : 1,661.90 = 1,031.00 : x
2. Step 2: Convert to fraction form
   1,113.35/1,661.90 = 1,031.00/x
3. Step 3: Cross multiply
   1,113.35x = 1,661.90 × 1,031.00
4. Step 4: Simplify right side
   1,113.35x = 1,713,411.23
5. Step 5: Solve for x
   x = 1,713,411.23/1,113.35
6. Step 6: Final answer
   x = 1,538.98