Finding the Fourth Proportional to 2,685.42, 4,027.32 and 1,042.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,685.42 : 4,027.32 = 1,042.20 : x
2. Step 2: Convert to fraction form
   2,685.42/4,027.32 = 1,042.20/x
3. Step 3: Cross multiply
   2,685.42x = 4,027.32 × 1,042.20
4. Step 4: Simplify right side
   2,685.42x = 4,197,272.90
5. Step 5: Solve for x
   x = 4,197,272.90/2,685.42
6. Step 6: Final answer
   x = 1,562.99