Finding the Fourth Proportional to 1,488.61, 2,054.28 and 899.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,488.61 : 2,054.28 = 899.03 : x
2. Step 2: Convert to fraction form
   1,488.61/2,054.28 = 899.03/x
3. Step 3: Cross multiply
   1,488.61x = 2,054.28 × 899.03
4. Step 4: Simplify right side
   1,488.61x = 1,846,864.48
5. Step 5: Solve for x
   x = 1,846,864.48/1,488.61
6. Step 6: Final answer
   x = 1,240.67