Finding the Fourth Proportional to 1,872.10, 2,807.34 and 1,439.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,872.10 : 2,807.34 = 1,439.56 : x
2. Step 2: Convert to fraction form
   1,872.10/2,807.34 = 1,439.56/x
3. Step 3: Cross multiply
   1,872.10x = 2,807.34 × 1,439.56
4. Step 4: Simplify right side
   1,872.10x = 4,041,334.37
5. Step 5: Solve for x
   x = 4,041,334.37/1,872.10
6. Step 6: Final answer
   x = 2,158.72