Finding the Fourth Proportional to 1,435.48, 1,979.40 and 1,042.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.48 : 1,979.40 = 1,042.72 : x
2. Step 2: Convert to fraction form
   1,435.48/1,979.40 = 1,042.72/x
3. Step 3: Cross multiply
   1,435.48x = 1,979.40 × 1,042.72
4. Step 4: Simplify right side
   1,435.48x = 2,063,959.97
5. Step 5: Solve for x
   x = 2,063,959.97/1,435.48
6. Step 6: Final answer
   x = 1,437.82