Finding the Fourth Proportional to 1,522.40, 2,100.74 and 859.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,522.40 : 2,100.74 = 859.28 : x
2. Step 2: Convert to fraction form
   1,522.40/2,100.74 = 859.28/x
3. Step 3: Cross multiply
   1,522.40x = 2,100.74 × 859.28
4. Step 4: Simplify right side
   1,522.40x = 1,805,123.87
5. Step 5: Solve for x
   x = 1,805,123.87/1,522.40
6. Step 6: Final answer
   x = 1,185.71