Finding the Fourth Proportional to 1,127.86, 1,690.56 and 717.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,127.86 : 1,690.56 = 717.18 : x
2. Step 2: Convert to fraction form
   1,127.86/1,690.56 = 717.18/x
3. Step 3: Cross multiply
   1,127.86x = 1,690.56 × 717.18
4. Step 4: Simplify right side
   1,127.86x = 1,212,435.82
5. Step 5: Solve for x
   x = 1,212,435.82/1,127.86
6. Step 6: Final answer
   x = 1,074.99