Finding the Fourth Proportional to 914.52, 1,261.59 and 879.15

Step by Step Solution

1. Step 1: Write the proportion equation
   914.52 : 1,261.59 = 879.15 : x
2. Step 2: Convert to fraction form
   914.52/1,261.59 = 879.15/x
3. Step 3: Cross multiply
   914.52x = 1,261.59 × 879.15
4. Step 4: Simplify right side
   914.52x = 1,109,126.85
5. Step 5: Solve for x
   x = 1,109,126.85/914.52
6. Step 6: Final answer
   x = 1,212.80