Finding the Fourth Proportional to 1,433.69, 1,978.85 and 874.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,433.69 : 1,978.85 = 874.47 : x
2. Step 2: Convert to fraction form
   1,433.69/1,978.85 = 874.47/x
3. Step 3: Cross multiply
   1,433.69x = 1,978.85 × 874.47
4. Step 4: Simplify right side
   1,433.69x = 1,730,440.59
5. Step 5: Solve for x
   x = 1,730,440.59/1,433.69
6. Step 6: Final answer
   x = 1,206.98