Finding the Fourth Proportional to 1,439.52, 1,987.20 and 942.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.52 : 1,987.20 = 942.18 : x
2. Step 2: Convert to fraction form
   1,439.52/1,987.20 = 942.18/x
3. Step 3: Cross multiply
   1,439.52x = 1,987.20 × 942.18
4. Step 4: Simplify right side
   1,439.52x = 1,872,300.10
5. Step 5: Solve for x
   x = 1,872,300.10/1,439.52
6. Step 6: Final answer
   x = 1,300.64