Finding the Fourth Proportional to 1,643.20, 2,258.15 and 1,567.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,643.20 : 2,258.15 = 1,567.06 : x
2. Step 2: Convert to fraction form
   1,643.20/2,258.15 = 1,567.06/x
3. Step 3: Cross multiply
   1,643.20x = 2,258.15 × 1,567.06
4. Step 4: Simplify right side
   1,643.20x = 3,538,656.54
5. Step 5: Solve for x
   x = 3,538,656.54/1,643.20
6. Step 6: Final answer
   x = 2,153.52