Finding the Fourth Proportional to 1,131.58, 1,693.83 and 760.66

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.58 : 1,693.83 = 760.66 : x
2. Step 2: Convert to fraction form
   1,131.58/1,693.83 = 760.66/x
3. Step 3: Cross multiply
   1,131.58x = 1,693.83 × 760.66
4. Step 4: Simplify right side
   1,131.58x = 1,288,428.73
5. Step 5: Solve for x
   x = 1,288,428.73/1,131.58
6. Step 6: Final answer
   x = 1,138.61