Finding the Fourth Proportional to 1,488.12, 2,053.53 and 858.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,488.12 : 2,053.53 = 858.75 : x
2. Step 2: Convert to fraction form
   1,488.12/2,053.53 = 858.75/x
3. Step 3: Cross multiply
   1,488.12x = 2,053.53 × 858.75
4. Step 4: Simplify right side
   1,488.12x = 1,763,468.89
5. Step 5: Solve for x
   x = 1,763,468.89/1,488.12
6. Step 6: Final answer
   x = 1,185.03