Finding the Fourth Proportional to 10,086.50, 13,912.07 and 7,778.36

Step by Step Solution

1. Step 1: Write the proportion equation
   10,086.50 : 13,912.07 = 7,778.36 : x
2. Step 2: Convert to fraction form
   10,086.50/13,912.07 = 7,778.36/x
3. Step 3: Cross multiply
   10,086.50x = 13,912.07 × 7,778.36
4. Step 4: Simplify right side
   10,086.50x = 108,212,980.35
5. Step 5: Solve for x
   x = 108,212,980.35/10,086.50
6. Step 6: Final answer
   x = 10,728.50