Finding the Fourth Proportional to 2,312.55, 3,191.31 and 1,317.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,312.55 : 3,191.31 = 1,317.82 : x
2. Step 2: Convert to fraction form
   2,312.55/3,191.31 = 1,317.82/x
3. Step 3: Cross multiply
   2,312.55x = 3,191.31 × 1,317.82
4. Step 4: Simplify right side
   2,312.55x = 4,205,572.14
5. Step 5: Solve for x
   x = 4,205,572.14/2,312.55
6. Step 6: Final answer
   x = 1,818.59