Finding the Fourth Proportional to 1,574.18, 2,171.18 and 1,042.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,574.18 : 2,171.18 = 1,042.12 : x
2. Step 2: Convert to fraction form
   1,574.18/2,171.18 = 1,042.12/x
3. Step 3: Cross multiply
   1,574.18x = 2,171.18 × 1,042.12
4. Step 4: Simplify right side
   1,574.18x = 2,262,630.10
5. Step 5: Solve for x
   x = 2,262,630.10/1,574.18
6. Step 6: Final answer
   x = 1,437.34