Finding the Fourth Proportional to 1,310.59, 1,808.72 and 867.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,310.59 : 1,808.72 = 867.72 : x
2. Step 2: Convert to fraction form
   1,310.59/1,808.72 = 867.72/x
3. Step 3: Cross multiply
   1,310.59x = 1,808.72 × 867.72
4. Step 4: Simplify right side
   1,310.59x = 1,569,462.52
5. Step 5: Solve for x
   x = 1,569,462.52/1,310.59
6. Step 6: Final answer
   x = 1,197.52