Finding the Fourth Proportional to 1,311.76, 1,810.54 and 814.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,311.76 : 1,810.54 = 814.10 : x
2. Step 2: Convert to fraction form
   1,311.76/1,810.54 = 814.10/x
3. Step 3: Cross multiply
   1,311.76x = 1,810.54 × 814.10
4. Step 4: Simplify right side
   1,311.76x = 1,473,960.61
5. Step 5: Solve for x
   x = 1,473,960.61/1,311.76
6. Step 6: Final answer
   x = 1,123.65