Finding the Fourth Proportional to 1,131.71, 1,561.06 and 851.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.71 : 1,561.06 = 851.50 : x
2. Step 2: Convert to fraction form
   1,131.71/1,561.06 = 851.50/x
3. Step 3: Cross multiply
   1,131.71x = 1,561.06 × 851.50
4. Step 4: Simplify right side
   1,131.71x = 1,329,242.59
5. Step 5: Solve for x
   x = 1,329,242.59/1,131.71
6. Step 6: Final answer
   x = 1,174.54