Finding the Fourth Proportional to 21,019.08, 29,006.52 and 13,061.64

Step by Step Solution

1. Step 1: Write the proportion equation
   21,019.08 : 29,006.52 = 13,061.64 : x
2. Step 2: Convert to fraction form
   21,019.08/29,006.52 = 13,061.64/x
3. Step 3: Cross multiply
   21,019.08x = 29,006.52 × 13,061.64
4. Step 4: Simplify right side
   21,019.08x = 378,872,721.89
5. Step 5: Solve for x
   x = 378,872,721.89/21,019.08
6. Step 6: Final answer
   x = 18,025.18