Finding the Fourth Proportional to 2,655.80, 3,980.89 and 899.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,655.80 : 3,980.89 = 899.25 : x
2. Step 2: Convert to fraction form
   2,655.80/3,980.89 = 899.25/x
3. Step 3: Cross multiply
   2,655.80x = 3,980.89 × 899.25
4. Step 4: Simplify right side
   2,655.80x = 3,579,815.33
5. Step 5: Solve for x
   x = 3,579,815.33/2,655.80
6. Step 6: Final answer
   x = 1,347.92