Finding the Fourth Proportional to 2,630.39, 3,945.85 and 899.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,630.39 : 3,945.85 = 899.15 : x
2. Step 2: Convert to fraction form
   2,630.39/3,945.85 = 899.15/x
3. Step 3: Cross multiply
   2,630.39x = 3,945.85 × 899.15
4. Step 4: Simplify right side
   2,630.39x = 3,547,889.05
5. Step 5: Solve for x
   x = 3,547,889.05/2,630.39
6. Step 6: Final answer
   x = 1,348.81