Finding the Fourth Proportional to 1,314.48, 1,803.12 and 1,287.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,314.48 : 1,803.12 = 1,287.15 : x
2. Step 2: Convert to fraction form
   1,314.48/1,803.12 = 1,287.15/x
3. Step 3: Cross multiply
   1,314.48x = 1,803.12 × 1,287.15
4. Step 4: Simplify right side
   1,314.48x = 2,320,885.91
5. Step 5: Solve for x
   x = 2,320,885.91/1,314.48
6. Step 6: Final answer
   x = 1,765.63