Finding the Fourth Proportional to 10,189.86, 15,215.78 and 8,086.25

Step by Step Solution

1. Step 1: Write the proportion equation
   10,189.86 : 15,215.78 = 8,086.25 : x
2. Step 2: Convert to fraction form
   10,189.86/15,215.78 = 8,086.25/x
3. Step 3: Cross multiply
   10,189.86x = 15,215.78 × 8,086.25
4. Step 4: Simplify right side
   10,189.86x = 123,038,484.51
5. Step 5: Solve for x
   x = 123,038,484.51/10,189.86
6. Step 6: Final answer
   x = 12,074.60