Finding the Fourth Proportional to 13,691.82, 18,894.24 and 7,722.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,691.82 : 18,894.24 = 7,722.72 : x
2. Step 2: Convert to fraction form
   13,691.82/18,894.24 = 7,722.72/x
3. Step 3: Cross multiply
   13,691.82x = 18,894.24 × 7,722.72
4. Step 4: Simplify right side
   13,691.82x = 145,914,925.13
5. Step 5: Solve for x
   x = 145,914,925.13/13,691.82
6. Step 6: Final answer
   x = 10,657.09