Finding the Fourth Proportional to 1,131.20, 1,697.04 and 766.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.20 : 1,697.04 = 766.72 : x
2. Step 2: Convert to fraction form
   1,131.20/1,697.04 = 766.72/x
3. Step 3: Cross multiply
   1,131.20x = 1,697.04 × 766.72
4. Step 4: Simplify right side
   1,131.20x = 1,301,154.51
5. Step 5: Solve for x
   x = 1,301,154.51/1,131.20
6. Step 6: Final answer
   x = 1,150.24