Finding the Fourth Proportional to 1,131.80, 1,698.17 and 1,040.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.80 : 1,698.17 = 1,040.98 : x
2. Step 2: Convert to fraction form
   1,131.80/1,698.17 = 1,040.98/x
3. Step 3: Cross multiply
   1,131.80x = 1,698.17 × 1,040.98
4. Step 4: Simplify right side
   1,131.80x = 1,767,761.01
5. Step 5: Solve for x
   x = 1,767,761.01/1,131.80
6. Step 6: Final answer
   x = 1,561.90