Finding the Fourth Proportional to 15,157.69, 20,917.61 and 8,870.06

Step by Step Solution

1. Step 1: Write the proportion equation
   15,157.69 : 20,917.61 = 8,870.06 : x
2. Step 2: Convert to fraction form
   15,157.69/20,917.61 = 8,870.06/x
3. Step 3: Cross multiply
   15,157.69x = 20,917.61 × 8,870.06
4. Step 4: Simplify right side
   15,157.69x = 185,540,496.96
5. Step 5: Solve for x
   x = 185,540,496.96/15,157.69
6. Step 6: Final answer
   x = 12,240.69