Finding the Fourth Proportional to 1,647.72, 2,272.02 and 1,228.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,647.72 : 2,272.02 = 1,228.32 : x
2. Step 2: Convert to fraction form
   1,647.72/2,272.02 = 1,228.32/x
3. Step 3: Cross multiply
   1,647.72x = 2,272.02 × 1,228.32
4. Step 4: Simplify right side
   1,647.72x = 2,790,767.61
5. Step 5: Solve for x
   x = 2,790,767.61/1,647.72
6. Step 6: Final answer
   x = 1,693.71