Finding the Fourth Proportional to 2,312.52, 3,191.30 and 1,317.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,312.52 : 3,191.30 = 1,317.79 : x
2. Step 2: Convert to fraction form
   2,312.52/3,191.30 = 1,317.79/x
3. Step 3: Cross multiply
   2,312.52x = 3,191.30 × 1,317.79
4. Step 4: Simplify right side
   2,312.52x = 4,205,456.64
5. Step 5: Solve for x
   x = 4,205,456.64/2,312.52
6. Step 6: Final answer
   x = 1,818.56