Finding the Fourth Proportional to 30,961.34, 42,719.67 and 20,908.22

Step by Step Solution

1. Step 1: Write the proportion equation
   30,961.34 : 42,719.67 = 20,908.22 : x
2. Step 2: Convert to fraction form
   30,961.34/42,719.67 = 20,908.22/x
3. Step 3: Cross multiply
   30,961.34x = 42,719.67 × 20,908.22
4. Step 4: Simplify right side
   30,961.34x = 893,192,258.69
5. Step 5: Solve for x
   x = 893,192,258.69/30,961.34
6. Step 6: Final answer
   x = 28,848.63