Finding the Fourth Proportional to 21,501.42, 29,661.27 and 18,665.01

Step by Step Solution

1. Step 1: Write the proportion equation
   21,501.42 : 29,661.27 = 18,665.01 : x
2. Step 2: Convert to fraction form
   21,501.42/29,661.27 = 18,665.01/x
3. Step 3: Cross multiply
   21,501.42x = 29,661.27 × 18,665.01
4. Step 4: Simplify right side
   21,501.42x = 553,627,901.16
5. Step 5: Solve for x
   x = 553,627,901.16/21,501.42
6. Step 6: Final answer
   x = 25,748.43