Finding the Fourth Proportional to 1,315.32, 1,817.75 and 1,078.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,315.32 : 1,817.75 = 1,078.89 : x
2. Step 2: Convert to fraction form
   1,315.32/1,817.75 = 1,078.89/x
3. Step 3: Cross multiply
   1,315.32x = 1,817.75 × 1,078.89
4. Step 4: Simplify right side
   1,315.32x = 1,961,146.90
5. Step 5: Solve for x
   x = 1,961,146.90/1,315.32
6. Step 6: Final answer
   x = 1,491.00