Finding the Fourth Proportional to 42,781.56, 59,040.78 and 25,791.21

Step by Step Solution

1. Step 1: Write the proportion equation
   42,781.56 : 59,040.78 = 25,791.21 : x
2. Step 2: Convert to fraction form
   42,781.56/59,040.78 = 25,791.21/x
3. Step 3: Cross multiply
   42,781.56x = 59,040.78 × 25,791.21
4. Step 4: Simplify right side
   42,781.56x = 1,522,733,155.54
5. Step 5: Solve for x
   x = 1,522,733,155.54/42,781.56
6. Step 6: Final answer
   x = 35,593.21