Finding the Fourth Proportional to 9,828.88, 14,736.84 and 3,978.64

Step by Step Solution

1. Step 1: Write the proportion equation
   9,828.88 : 14,736.84 = 3,978.64 : x
2. Step 2: Convert to fraction form
   9,828.88/14,736.84 = 3,978.64/x
3. Step 3: Cross multiply
   9,828.88x = 14,736.84 × 3,978.64
4. Step 4: Simplify right side
   9,828.88x = 58,632,581.10
5. Step 5: Solve for x
   x = 58,632,581.10/9,828.88
6. Step 6: Final answer
   x = 5,965.34