Finding the Fourth Proportional to 10,862.76, 16,288.66 and 5,307.78

Step by Step Solution

1. Step 1: Write the proportion equation
   10,862.76 : 16,288.66 = 5,307.78 : x
2. Step 2: Convert to fraction form
   10,862.76/16,288.66 = 5,307.78/x
3. Step 3: Cross multiply
   10,862.76x = 16,288.66 × 5,307.78
4. Step 4: Simplify right side
   10,862.76x = 86,456,623.77
5. Step 5: Solve for x
   x = 86,456,623.77/10,862.76
6. Step 6: Final answer
   x = 7,958.99