Finding the Fourth Proportional to 1,653.01, 2,280.91 and 989.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,653.01 : 2,280.91 = 989.72 : x
2. Step 2: Convert to fraction form
   1,653.01/2,280.91 = 989.72/x
3. Step 3: Cross multiply
   1,653.01x = 2,280.91 × 989.72
4. Step 4: Simplify right side
   1,653.01x = 2,257,458.78
5. Step 5: Solve for x
   x = 2,257,458.78/1,653.01
6. Step 6: Final answer
   x = 1,365.67