Finding the Fourth Proportional to 1,442.60, 1,989.72 and 918.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,442.60 : 1,989.72 = 918.16 : x
2. Step 2: Convert to fraction form
   1,442.60/1,989.72 = 918.16/x
3. Step 3: Cross multiply
   1,442.60x = 1,989.72 × 918.16
4. Step 4: Simplify right side
   1,442.60x = 1,826,881.32
5. Step 5: Solve for x
   x = 1,826,881.32/1,442.60
6. Step 6: Final answer
   x = 1,266.38