Finding the Fourth Proportional to 1,311.41, 1,810.41 and 1,011.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,311.41 : 1,810.41 = 1,011.98 : x
2. Step 2: Convert to fraction form
   1,311.41/1,810.41 = 1,011.98/x
3. Step 3: Cross multiply
   1,311.41x = 1,810.41 × 1,011.98
4. Step 4: Simplify right side
   1,311.41x = 1,832,105.57
5. Step 5: Solve for x
   x = 1,832,105.57/1,311.41
6. Step 6: Final answer
   x = 1,397.05