Finding the Fourth Proportional to 19,665.30, 29,492.79 and 13,424.16

Step by Step Solution

1. Step 1: Write the proportion equation
   19,665.30 : 29,492.79 = 13,424.16 : x
2. Step 2: Convert to fraction form
   19,665.30/29,492.79 = 13,424.16/x
3. Step 3: Cross multiply
   19,665.30x = 29,492.79 × 13,424.16
4. Step 4: Simplify right side
   19,665.30x = 395,915,931.81
5. Step 5: Solve for x
   x = 395,915,931.81/19,665.30
6. Step 6: Final answer
   x = 20,132.72