Finding the Fourth Proportional to 1,521.87, 2,100.25 and 892.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,521.87 : 2,100.25 = 892.31 : x
2. Step 2: Convert to fraction form
   1,521.87/2,100.25 = 892.31/x
3. Step 3: Cross multiply
   1,521.87x = 2,100.25 × 892.31
4. Step 4: Simplify right side
   1,521.87x = 1,874,074.87
5. Step 5: Solve for x
   x = 1,874,074.87/1,521.87
6. Step 6: Final answer
   x = 1,231.43