Finding the Fourth Proportional to 13,632.42, 18,811.89 and 7,664.01

Step by Step Solution

1. Step 1: Write the proportion equation
   13,632.42 : 18,811.89 = 7,664.01 : x
2. Step 2: Convert to fraction form
   13,632.42/18,811.89 = 7,664.01/x
3. Step 3: Cross multiply
   13,632.42x = 18,811.89 × 7,664.01
4. Step 4: Simplify right side
   13,632.42x = 144,174,513.08
5. Step 5: Solve for x
   x = 144,174,513.08/13,632.42
6. Step 6: Final answer
   x = 10,575.86