Finding the Fourth Proportional to 1,434.10, 1,978.47 and 874.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.10 : 1,978.47 = 874.48 : x
2. Step 2: Convert to fraction form
   1,434.10/1,978.47 = 874.48/x
3. Step 3: Cross multiply
   1,434.10x = 1,978.47 × 874.48
4. Step 4: Simplify right side
   1,434.10x = 1,730,132.45
5. Step 5: Solve for x
   x = 1,730,132.45/1,434.10
6. Step 6: Final answer
   x = 1,206.42