Finding the Fourth Proportional to 15,111.89, 20,853.99 and 8,397.34

Step by Step Solution

1. Step 1: Write the proportion equation
   15,111.89 : 20,853.99 = 8,397.34 : x
2. Step 2: Convert to fraction form
   15,111.89/20,853.99 = 8,397.34/x
3. Step 3: Cross multiply
   15,111.89x = 20,853.99 × 8,397.34
4. Step 4: Simplify right side
   15,111.89x = 175,118,002.40
5. Step 5: Solve for x
   x = 175,118,002.40/15,111.89
6. Step 6: Final answer
   x = 11,588.10