Finding the Fourth Proportional to 1,060.80, 1,464.24 and 840.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,060.80 : 1,464.24 = 840.72 : x
2. Step 2: Convert to fraction form
   1,060.80/1,464.24 = 840.72/x
3. Step 3: Cross multiply
   1,060.80x = 1,464.24 × 840.72
4. Step 4: Simplify right side
   1,060.80x = 1,231,015.85
5. Step 5: Solve for x
   x = 1,231,015.85/1,060.80
6. Step 6: Final answer
   x = 1,160.46