Finding the Fourth Proportional to 1,442.02, 1,987.96 and 1,220.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,442.02 : 1,987.96 = 1,220.08 : x
2. Step 2: Convert to fraction form
   1,442.02/1,987.96 = 1,220.08/x
3. Step 3: Cross multiply
   1,442.02x = 1,987.96 × 1,220.08
4. Step 4: Simplify right side
   1,442.02x = 2,425,470.24
5. Step 5: Solve for x
   x = 2,425,470.24/1,442.02
6. Step 6: Final answer
   x = 1,681.99