Finding the Fourth Proportional to 8,061.72, 12,078.40 and 5,251.36

Step by Step Solution

1. Step 1: Write the proportion equation
   8,061.72 : 12,078.40 = 5,251.36 : x
2. Step 2: Convert to fraction form
   8,061.72/12,078.40 = 5,251.36/x
3. Step 3: Cross multiply
   8,061.72x = 12,078.40 × 5,251.36
4. Step 4: Simplify right side
   8,061.72x = 63,428,026.62
5. Step 5: Solve for x
   x = 63,428,026.62/8,061.72
6. Step 6: Final answer
   x = 7,867.80