Finding the Fourth Proportional to 3,123.15, 4,309.43 and 1,864.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,123.15 : 4,309.43 = 1,864.72 : x
2. Step 2: Convert to fraction form
   3,123.15/4,309.43 = 1,864.72/x
3. Step 3: Cross multiply
   3,123.15x = 4,309.43 × 1,864.72
4. Step 4: Simplify right side
   3,123.15x = 8,035,849.44
5. Step 5: Solve for x
   x = 8,035,849.44/3,123.15
6. Step 6: Final answer
   x = 2,573.00