Finding the Fourth Proportional to 1,439.16, 2,157.52 and 1,371.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.16 : 2,157.52 = 1,371.12 : x
2. Step 2: Convert to fraction form
   1,439.16/2,157.52 = 1,371.12/x
3. Step 3: Cross multiply
   1,439.16x = 2,157.52 × 1,371.12
4. Step 4: Simplify right side
   1,439.16x = 2,958,218.82
5. Step 5: Solve for x
   x = 2,958,218.82/1,439.16
6. Step 6: Final answer
   x = 2,055.52