Finding the Fourth Proportional to 10,208.76, 15,188.86 and 10,174.20

Step by Step Solution

1. Step 1: Write the proportion equation
   10,208.76 : 15,188.86 = 10,174.20 : x
2. Step 2: Convert to fraction form
   10,208.76/15,188.86 = 10,174.20/x
3. Step 3: Cross multiply
   10,208.76x = 15,188.86 × 10,174.20
4. Step 4: Simplify right side
   10,208.76x = 154,534,499.41
5. Step 5: Solve for x
   x = 154,534,499.41/10,208.76
6. Step 6: Final answer
   x = 15,137.44