Finding the Fourth Proportional to 13,101.64, 18,086.35 and 7,722.38

Step by Step Solution

1. Step 1: Write the proportion equation
   13,101.64 : 18,086.35 = 7,722.38 : x
2. Step 2: Convert to fraction form
   13,101.64/18,086.35 = 7,722.38/x
3. Step 3: Cross multiply
   13,101.64x = 18,086.35 × 7,722.38
4. Step 4: Simplify right side
   13,101.64x = 139,669,667.51
5. Step 5: Solve for x
   x = 139,669,667.51/13,101.64
6. Step 6: Final answer
   x = 10,660.47