Finding the Fourth Proportional to 1,488.71, 2,054.23 and 825.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,488.71 : 2,054.23 = 825.55 : x
2. Step 2: Convert to fraction form
   1,488.71/2,054.23 = 825.55/x
3. Step 3: Cross multiply
   1,488.71x = 2,054.23 × 825.55
4. Step 4: Simplify right side
   1,488.71x = 1,695,869.58
5. Step 5: Solve for x
   x = 1,695,869.58/1,488.71
6. Step 6: Final answer
   x = 1,139.15