Finding the Fourth Proportional to 1,870.72, 2,806.32 and 717.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,870.72 : 2,806.32 = 717.28 : x
2. Step 2: Convert to fraction form
   1,870.72/2,806.32 = 717.28/x
3. Step 3: Cross multiply
   1,870.72x = 2,806.32 × 717.28
4. Step 4: Simplify right side
   1,870.72x = 2,012,917.21
5. Step 5: Solve for x
   x = 2,012,917.21/1,870.72
6. Step 6: Final answer
   x = 1,076.01