Finding the Fourth Proportional to 1,521.97, 2,100.27 and 858.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,521.97 : 2,100.27 = 858.79 : x
2. Step 2: Convert to fraction form
   1,521.97/2,100.27 = 858.79/x
3. Step 3: Cross multiply
   1,521.97x = 2,100.27 × 858.79
4. Step 4: Simplify right side
   1,521.97x = 1,803,690.87
5. Step 5: Solve for x
   x = 1,803,690.87/1,521.97
6. Step 6: Final answer
   x = 1,185.10