Finding the Fourth Proportional to 1,131.71, 1,698.05 and 611.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.71 : 1,698.05 = 611.10 : x
2. Step 2: Convert to fraction form
   1,131.71/1,698.05 = 611.10/x
3. Step 3: Cross multiply
   1,131.71x = 1,698.05 × 611.10
4. Step 4: Simplify right side
   1,131.71x = 1,037,679.88
5. Step 5: Solve for x
   x = 1,037,679.88/1,131.71
6. Step 6: Final answer
   x = 916.92