Finding the Fourth Proportional to 2,312.57, 3,188.62 and 1,869.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,312.57 : 3,188.62 = 1,869.10 : x
2. Step 2: Convert to fraction form
   2,312.57/3,188.62 = 1,869.10/x
3. Step 3: Cross multiply
   2,312.57x = 3,188.62 × 1,869.10
4. Step 4: Simplify right side
   2,312.57x = 5,959,849.64
5. Step 5: Solve for x
   x = 5,959,849.64/2,312.57
6. Step 6: Final answer
   x = 2,577.15