Finding the Fourth Proportional to 1,442.34, 1,989.84 and 917.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,442.34 : 1,989.84 = 917.46 : x
2. Step 2: Convert to fraction form
   1,442.34/1,989.84 = 917.46/x
3. Step 3: Cross multiply
   1,442.34x = 1,989.84 × 917.46
4. Step 4: Simplify right side
   1,442.34x = 1,825,598.61
5. Step 5: Solve for x
   x = 1,825,598.61/1,442.34
6. Step 6: Final answer
   x = 1,265.72