Finding the Fourth Proportional to 1,442.02, 1,989.69 and 917.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,442.02 : 1,989.69 = 917.86 : x
2. Step 2: Convert to fraction form
   1,442.02/1,989.69 = 917.86/x
3. Step 3: Cross multiply
   1,442.02x = 1,989.69 × 917.86
4. Step 4: Simplify right side
   1,442.02x = 1,826,256.86
5. Step 5: Solve for x
   x = 1,826,256.86/1,442.02
6. Step 6: Final answer
   x = 1,266.46