Finding the Fourth Proportional to 1,653.30, 2,280.77 and 990.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,653.30 : 2,280.77 = 990.03 : x
2. Step 2: Convert to fraction form
   1,653.30/2,280.77 = 990.03/x
3. Step 3: Cross multiply
   1,653.30x = 2,280.77 × 990.03
4. Step 4: Simplify right side
   1,653.30x = 2,258,030.72
5. Step 5: Solve for x
   x = 2,258,030.72/1,653.30
6. Step 6: Final answer
   x = 1,365.77