Finding the Fourth Proportional to 1,521.95, 2,100.25 and 858.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,521.95 : 2,100.25 = 858.81 : x
2. Step 2: Convert to fraction form
   1,521.95/2,100.25 = 858.81/x
3. Step 3: Cross multiply
   1,521.95x = 2,100.25 × 858.81
4. Step 4: Simplify right side
   1,521.95x = 1,803,713.56
5. Step 5: Solve for x
   x = 1,803,713.56/1,521.95
6. Step 6: Final answer
   x = 1,185.14