Finding the Fourth Proportional to 2,312.91, 3,191.04 and 1,317.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,312.91 : 3,191.04 = 1,317.48 : x
2. Step 2: Convert to fraction form
   2,312.91/3,191.04 = 1,317.48/x
3. Step 3: Cross multiply
   2,312.91x = 3,191.04 × 1,317.48
4. Step 4: Simplify right side
   2,312.91x = 4,204,131.38
5. Step 5: Solve for x
   x = 4,204,131.38/2,312.91
6. Step 6: Final answer
   x = 1,817.68