Finding the Fourth Proportional to 42,906.78, 64,369.86 and 15,204.78

Step by Step Solution

1. Step 1: Write the proportion equation
   42,906.78 : 64,369.86 = 15,204.78 : x
2. Step 2: Convert to fraction form
   42,906.78/64,369.86 = 15,204.78/x
3. Step 3: Cross multiply
   42,906.78x = 64,369.86 × 15,204.78
4. Step 4: Simplify right side
   42,906.78x = 978,729,559.93
5. Step 5: Solve for x
   x = 978,729,559.93/42,906.78
6. Step 6: Final answer
   x = 22,810.60