Finding the Fourth Proportional to 932.18, 1,387.61 and 918.33

Step by Step Solution

1. Step 1: Write the proportion equation
   932.18 : 1,387.61 = 918.33 : x
2. Step 2: Convert to fraction form
   932.18/1,387.61 = 918.33/x
3. Step 3: Cross multiply
   932.18x = 1,387.61 × 918.33
4. Step 4: Simplify right side
   932.18x = 1,274,283.89
5. Step 5: Solve for x
   x = 1,274,283.89/932.18
6. Step 6: Final answer
   x = 1,366.99