Finding the Fourth Proportional to 21,109.42, 31,529.29 and 19,105.04

Step by Step Solution

1. Step 1: Write the proportion equation
   21,109.42 : 31,529.29 = 19,105.04 : x
2. Step 2: Convert to fraction form
   21,109.42/31,529.29 = 19,105.04/x
3. Step 3: Cross multiply
   21,109.42x = 31,529.29 × 19,105.04
4. Step 4: Simplify right side
   21,109.42x = 602,368,388.64
5. Step 5: Solve for x
   x = 602,368,388.64/21,109.42
6. Step 6: Final answer
   x = 28,535.53