Finding the Fourth Proportional to 20,758.78, 31,150.47 and 19,445.29

Step by Step Solution

1. Step 1: Write the proportion equation
   20,758.78 : 31,150.47 = 19,445.29 : x
2. Step 2: Convert to fraction form
   20,758.78/31,150.47 = 19,445.29/x
3. Step 3: Cross multiply
   20,758.78x = 31,150.47 × 19,445.29
4. Step 4: Simplify right side
   20,758.78x = 605,729,669.81
5. Step 5: Solve for x
   x = 605,729,669.81/20,758.78
6. Step 6: Final answer
   x = 29,179.45