Finding the Fourth Proportional to 2,312.17, 3,191.18 and 1,818.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,312.17 : 3,191.18 = 1,818.57 : x
2. Step 2: Convert to fraction form
   2,312.17/3,191.18 = 1,818.57/x
3. Step 3: Cross multiply
   2,312.17x = 3,191.18 × 1,818.57
4. Step 4: Simplify right side
   2,312.17x = 5,803,384.21
5. Step 5: Solve for x
   x = 5,803,384.21/2,312.17
6. Step 6: Final answer
   x = 2,509.93