Finding the Fourth Proportional to 1,442.06, 2,160.72 and 747.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,442.06 : 2,160.72 = 747.77 : x
2. Step 2: Convert to fraction form
   1,442.06/2,160.72 = 747.77/x
3. Step 3: Cross multiply
   1,442.06x = 2,160.72 × 747.77
4. Step 4: Simplify right side
   1,442.06x = 1,615,710.79
5. Step 5: Solve for x
   x = 1,615,710.79/1,442.06
6. Step 6: Final answer
   x = 1,120.42