Finding the Fourth Proportional to 12,876.78, 19,301.85 and 7,318.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,876.78 : 19,301.85 = 7,318.15 : x
2. Step 2: Convert to fraction form
   12,876.78/19,301.85 = 7,318.15/x
3. Step 3: Cross multiply
   12,876.78x = 19,301.85 × 7,318.15
4. Step 4: Simplify right side
   12,876.78x = 141,253,833.58
5. Step 5: Solve for x
   x = 141,253,833.58/12,876.78
6. Step 6: Final answer
   x = 10,969.65