Finding the Fourth Proportional to 1,853.31, 2,781.34 and 879.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,853.31 : 2,781.34 = 879.42 : x
2. Step 2: Convert to fraction form
   1,853.31/2,781.34 = 879.42/x
3. Step 3: Cross multiply
   1,853.31x = 2,781.34 × 879.42
4. Step 4: Simplify right side
   1,853.31x = 2,445,966.02
5. Step 5: Solve for x
   x = 2,445,966.02/1,853.31
6. Step 6: Final answer
   x = 1,319.78