Finding the Fourth Proportional to 28,616.40, 42,921.72 and 7,842.96

Step by Step Solution

1. Step 1: Write the proportion equation
   28,616.40 : 42,921.72 = 7,842.96 : x
2. Step 2: Convert to fraction form
   28,616.40/42,921.72 = 7,842.96/x
3. Step 3: Cross multiply
   28,616.40x = 42,921.72 × 7,842.96
4. Step 4: Simplify right side
   28,616.40x = 336,633,333.09
5. Step 5: Solve for x
   x = 336,633,333.09/28,616.40
6. Step 6: Final answer
   x = 11,763.65