Finding the Fourth Proportional to 1,680.41, 2,521.33 and 900.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,680.41 : 2,521.33 = 900.20 : x
2. Step 2: Convert to fraction form
   1,680.41/2,521.33 = 900.20/x
3. Step 3: Cross multiply
   1,680.41x = 2,521.33 × 900.20
4. Step 4: Simplify right side
   1,680.41x = 2,269,705.32
5. Step 5: Solve for x
   x = 2,269,705.32/1,680.41
6. Step 6: Final answer
   x = 1,350.68