Finding the Fourth Proportional to 30,897.72, 42,635.70 and 18,961.56

Step by Step Solution

1. Step 1: Write the proportion equation
   30,897.72 : 42,635.70 = 18,961.56 : x
2. Step 2: Convert to fraction form
   30,897.72/42,635.70 = 18,961.56/x
3. Step 3: Cross multiply
   30,897.72x = 42,635.70 × 18,961.56
4. Step 4: Simplify right side
   30,897.72x = 808,439,383.69
5. Step 5: Solve for x
   x = 808,439,383.69/30,897.72
6. Step 6: Final answer
   x = 26,165.02