Finding the Fourth Proportional to 1,521.84, 2,100.23 and 858.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,521.84 : 2,100.23 = 858.72 : x
2. Step 2: Convert to fraction form
   1,521.84/2,100.23 = 858.72/x
3. Step 3: Cross multiply
   1,521.84x = 2,100.23 × 858.72
4. Step 4: Simplify right side
   1,521.84x = 1,803,509.51
5. Step 5: Solve for x
   x = 1,803,509.51/1,521.84
6. Step 6: Final answer
   x = 1,185.08