Finding the Fourth Proportional to 1,521.76, 2,100.04 and 858.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,521.76 : 2,100.04 = 858.58 : x
2. Step 2: Convert to fraction form
   1,521.76/2,100.04 = 858.58/x
3. Step 3: Cross multiply
   1,521.76x = 2,100.04 × 858.58
4. Step 4: Simplify right side
   1,521.76x = 1,803,052.34
5. Step 5: Solve for x
   x = 1,803,052.34/1,521.76
6. Step 6: Final answer
   x = 1,184.85