Finding the Fourth Proportional to 1,439.95, 1,986.61 and 880.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.95 : 1,986.61 = 880.24 : x
2. Step 2: Convert to fraction form
   1,439.95/1,986.61 = 880.24/x
3. Step 3: Cross multiply
   1,439.95x = 1,986.61 × 880.24
4. Step 4: Simplify right side
   1,439.95x = 1,748,693.59
5. Step 5: Solve for x
   x = 1,748,693.59/1,439.95
6. Step 6: Final answer
   x = 1,214.41