Finding the Fourth Proportional to 21,088.08, 29,061.56 and 15,109.52

Step by Step Solution

1. Step 1: Write the proportion equation
   21,088.08 : 29,061.56 = 15,109.52 : x
2. Step 2: Convert to fraction form
   21,088.08/29,061.56 = 15,109.52/x
3. Step 3: Cross multiply
   21,088.08x = 29,061.56 × 15,109.52
4. Step 4: Simplify right side
   21,088.08x = 439,106,222.05
5. Step 5: Solve for x
   x = 439,106,222.05/21,088.08
6. Step 6: Final answer
   x = 20,822.48