Finding the Fourth Proportional to 1,412.72, 2,117.49 and 718.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,412.72 : 2,117.49 = 718.40 : x
2. Step 2: Convert to fraction form
   1,412.72/2,117.49 = 718.40/x
3. Step 3: Cross multiply
   1,412.72x = 2,117.49 × 718.40
4. Step 4: Simplify right side
   1,412.72x = 1,521,204.82
5. Step 5: Solve for x
   x = 1,521,204.82/1,412.72
6. Step 6: Final answer
   x = 1,076.79