Finding the Fourth Proportional to 1,434.48, 1,980.18 and 874.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.48 : 1,980.18 = 874.78 : x
2. Step 2: Convert to fraction form
   1,434.48/1,980.18 = 874.78/x
3. Step 3: Cross multiply
   1,434.48x = 1,980.18 × 874.78
4. Step 4: Simplify right side
   1,434.48x = 1,732,221.86
5. Step 5: Solve for x
   x = 1,732,221.86/1,434.48
6. Step 6: Final answer
   x = 1,207.56