Finding the Fourth Proportional to 1,812.61, 2,719.82 and 717.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,812.61 : 2,719.82 = 717.89 : x
2. Step 2: Convert to fraction form
   1,812.61/2,719.82 = 717.89/x
3. Step 3: Cross multiply
   1,812.61x = 2,719.82 × 717.89
4. Step 4: Simplify right side
   1,812.61x = 1,952,531.58
5. Step 5: Solve for x
   x = 1,952,531.58/1,812.61
6. Step 6: Final answer
   x = 1,077.20