Finding the Fourth Proportional to 1,488.56, 2,054.28 and 899.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,488.56 : 2,054.28 = 899.18 : x
2. Step 2: Convert to fraction form
   1,488.56/2,054.28 = 899.18/x
3. Step 3: Cross multiply
   1,488.56x = 2,054.28 × 899.18
4. Step 4: Simplify right side
   1,488.56x = 1,847,167.49
5. Step 5: Solve for x
   x = 1,847,167.49/1,488.56
6. Step 6: Final answer
   x = 1,240.91