Finding the Fourth Proportional to 1,522.09, 2,100.58 and 858.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,522.09 : 2,100.58 = 858.70 : x
2. Step 2: Convert to fraction form
   1,522.09/2,100.58 = 858.70/x
3. Step 3: Cross multiply
   1,522.09x = 2,100.58 × 858.70
4. Step 4: Simplify right side
   1,522.09x = 1,803,773.36
5. Step 5: Solve for x
   x = 1,803,773.36/1,522.09
6. Step 6: Final answer
   x = 1,185.06