Finding the Fourth Proportional to 1,417.76, 1,955.56 and 879.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,417.76 : 1,955.56 = 879.20 : x
2. Step 2: Convert to fraction form
   1,417.76/1,955.56 = 879.20/x
3. Step 3: Cross multiply
   1,417.76x = 1,955.56 × 879.20
4. Step 4: Simplify right side
   1,417.76x = 1,719,328.35
5. Step 5: Solve for x
   x = 1,719,328.35/1,417.76
6. Step 6: Final answer
   x = 1,212.71