Finding the Fourth Proportional to 30,881.52, 42,615.72 and 18,306

Step by Step Solution

1. Step 1: Write the proportion equation
   30,881.52 : 42,615.72 = 18,306 : x
2. Step 2: Convert to fraction form
   30,881.52/42,615.72 = 18,306/x
3. Step 3: Cross multiply
   30,881.52x = 42,615.72 × 18,306
4. Step 4: Simplify right side
   30,881.52x = 780,123,370.32
5. Step 5: Solve for x
   x = 780,123,370.32/30,881.52
6. Step 6: Final answer
   x = 25,261.82