Finding the Fourth Proportional to 1,653.37, 2,280.86 and 990.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,653.37 : 2,280.86 = 990.10 : x
2. Step 2: Convert to fraction form
   1,653.37/2,280.86 = 990.10/x
3. Step 3: Cross multiply
   1,653.37x = 2,280.86 × 990.10
4. Step 4: Simplify right side
   1,653.37x = 2,258,273.84
5. Step 5: Solve for x
   x = 2,258,273.84/1,653.37
6. Step 6: Final answer
   x = 1,365.86