Finding the Fourth Proportional to 1,488.03, 2,053.31 and 858.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,488.03 : 2,053.31 = 858.55 : x
2. Step 2: Convert to fraction form
   1,488.03/2,053.31 = 858.55/x
3. Step 3: Cross multiply
   1,488.03x = 2,053.31 × 858.55
4. Step 4: Simplify right side
   1,488.03x = 1,762,869.30
5. Step 5: Solve for x
   x = 1,762,869.30/1,488.03
6. Step 6: Final answer
   x = 1,184.70