Finding the Fourth Proportional to 1,438.52, 2,158.72 and 708.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,438.52 : 2,158.72 = 708.10 : x
2. Step 2: Convert to fraction form
   1,438.52/2,158.72 = 708.10/x
3. Step 3: Cross multiply
   1,438.52x = 2,158.72 × 708.10
4. Step 4: Simplify right side
   1,438.52x = 1,528,582.46
5. Step 5: Solve for x
   x = 1,528,582.46/1,438.52
6. Step 6: Final answer
   x = 1,062.61