Finding the Fourth Proportional to 1,403.89, 2,105.96 and 480.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,403.89 : 2,105.96 = 480.09 : x
2. Step 2: Convert to fraction form
   1,403.89/2,105.96 = 480.09/x
3. Step 3: Cross multiply
   1,403.89x = 2,105.96 × 480.09
4. Step 4: Simplify right side
   1,403.89x = 1,011,050.34
5. Step 5: Solve for x
   x = 1,011,050.34/1,403.89
6. Step 6: Final answer
   x = 720.18