Finding the Fourth Proportional to 1,434.24, 1,978.56 and 1,020.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.24 : 1,978.56 = 1,020.48 : x
2. Step 2: Convert to fraction form
   1,434.24/1,978.56 = 1,020.48/x
3. Step 3: Cross multiply
   1,434.24x = 1,978.56 × 1,020.48
4. Step 4: Simplify right side
   1,434.24x = 2,019,080.91
5. Step 5: Solve for x
   x = 2,019,080.91/1,434.24
6. Step 6: Final answer
   x = 1,407.77