Finding the Fourth Proportional to 13,693.31, 18,894.61 and 7,724.86

Step by Step Solution

1. Step 1: Write the proportion equation
   13,693.31 : 18,894.61 = 7,724.86 : x
2. Step 2: Convert to fraction form
   13,693.31/18,894.61 = 7,724.86/x
3. Step 3: Cross multiply
   13,693.31x = 18,894.61 × 7,724.86
4. Step 4: Simplify right side
   13,693.31x = 145,958,179.42
5. Step 5: Solve for x
   x = 145,958,179.42/13,693.31
6. Step 6: Final answer
   x = 10,659.09