Finding the Fourth Proportional to 30,867.78, 42,557.76 and 25,196.70

Step by Step Solution

1. Step 1: Write the proportion equation
   30,867.78 : 42,557.76 = 25,196.70 : x
2. Step 2: Convert to fraction form
   30,867.78/42,557.76 = 25,196.70/x
3. Step 3: Cross multiply
   30,867.78x = 42,557.76 × 25,196.70
4. Step 4: Simplify right side
   30,867.78x = 1,072,315,111.39
5. Step 5: Solve for x
   x = 1,072,315,111.39/30,867.78
6. Step 6: Final answer
   x = 34,738.98