Finding the Fourth Proportional to 1,411.34, 2,117.20 and 717.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,411.34 : 2,117.20 = 717.78 : x
2. Step 2: Convert to fraction form
   1,411.34/2,117.20 = 717.78/x
3. Step 3: Cross multiply
   1,411.34x = 2,117.20 × 717.78
4. Step 4: Simplify right side
   1,411.34x = 1,519,683.82
5. Step 5: Solve for x
   x = 1,519,683.82/1,411.34
6. Step 6: Final answer
   x = 1,076.77