Finding the Fourth Proportional to 1,521.56, 2,099.77 and 858.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,521.56 : 2,099.77 = 858.42 : x
2. Step 2: Convert to fraction form
   1,521.56/2,099.77 = 858.42/x
3. Step 3: Cross multiply
   1,521.56x = 2,099.77 × 858.42
4. Step 4: Simplify right side
   1,521.56x = 1,802,484.56
5. Step 5: Solve for x
   x = 1,802,484.56/1,521.56
6. Step 6: Final answer
   x = 1,184.63