Finding the Fourth Proportional to 2,312.67, 3,191.46 and 1,318.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,312.67 : 3,191.46 = 1,318.05 : x
2. Step 2: Convert to fraction form
   2,312.67/3,191.46 = 1,318.05/x
3. Step 3: Cross multiply
   2,312.67x = 3,191.46 × 1,318.05
4. Step 4: Simplify right side
   2,312.67x = 4,206,503.85
5. Step 5: Solve for x
   x = 4,206,503.85/2,312.67
6. Step 6: Final answer
   x = 1,818.89