Finding the Fourth Proportional to 10,656, 15,978.96 and 3,258.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,656 : 15,978.96 = 3,258.72 : x
2. Step 2: Convert to fraction form
   10,656/15,978.96 = 3,258.72/x
3. Step 3: Cross multiply
   10,656x = 15,978.96 × 3,258.72
4. Step 4: Simplify right side
   10,656x = 52,070,956.53
5. Step 5: Solve for x
   x = 52,070,956.53/10,656
6. Step 6: Final answer
   x = 4,886.54