Finding the Fourth Proportional to 10,991.46, 15,170.50 and 10,105.86

Step by Step Solution

1. Step 1: Write the proportion equation
   10,991.46 : 15,170.50 = 10,105.86 : x
2. Step 2: Convert to fraction form
   10,991.46/15,170.50 = 10,105.86/x
3. Step 3: Cross multiply
   10,991.46x = 15,170.50 × 10,105.86
4. Step 4: Simplify right side
   10,991.46x = 153,310,848.01
5. Step 5: Solve for x
   x = 153,310,848.01/10,991.46
6. Step 6: Final answer
   x = 13,948.19