Finding the Fourth Proportional to 13,656.59, 18,847.89 and 7,689.42

Step by Step Solution

1. Step 1: Write the proportion equation
   13,656.59 : 18,847.89 = 7,689.42 : x
2. Step 2: Convert to fraction form
   13,656.59/18,847.89 = 7,689.42/x
3. Step 3: Cross multiply
   13,656.59x = 18,847.89 × 7,689.42
4. Step 4: Simplify right side
   13,656.59x = 144,929,342.32
5. Step 5: Solve for x
   x = 144,929,342.32/13,656.59
6. Step 6: Final answer
   x = 10,612.41