Finding the Fourth Proportional to 2,653.32, 3,658.86 and 1,989.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,653.32 : 3,658.86 = 1,989.12 : x
2. Step 2: Convert to fraction form
   2,653.32/3,658.86 = 1,989.12/x
3. Step 3: Cross multiply
   2,653.32x = 3,658.86 × 1,989.12
4. Step 4: Simplify right side
   2,653.32x = 7,277,911.60
5. Step 5: Solve for x
   x = 7,277,911.60/2,653.32
6. Step 6: Final answer
   x = 2,742.95