Finding the Fourth Proportional to 21,878.72, 32,735.04 and 13,415.04

Step by Step Solution

1. Step 1: Write the proportion equation
   21,878.72 : 32,735.04 = 13,415.04 : x
2. Step 2: Convert to fraction form
   21,878.72/32,735.04 = 13,415.04/x
3. Step 3: Cross multiply
   21,878.72x = 32,735.04 × 13,415.04
4. Step 4: Simplify right side
   21,878.72x = 439,141,871.00
5. Step 5: Solve for x
   x = 439,141,871.00/21,878.72
6. Step 6: Final answer
   x = 20,071.64