Finding the Fourth Proportional to 1,489.98, 2,055.63 and 900.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,489.98 : 2,055.63 = 900.30 : x
2. Step 2: Convert to fraction form
   1,489.98/2,055.63 = 900.30/x
3. Step 3: Cross multiply
   1,489.98x = 2,055.63 × 900.30
4. Step 4: Simplify right side
   1,489.98x = 1,850,683.69
5. Step 5: Solve for x
   x = 1,850,683.69/1,489.98
6. Step 6: Final answer
   x = 1,242.09