Finding the Fourth Proportional to 30,651.48, 42,300.72 and 18,711.36

Step by Step Solution

1. Step 1: Write the proportion equation
   30,651.48 : 42,300.72 = 18,711.36 : x
2. Step 2: Convert to fraction form
   30,651.48/42,300.72 = 18,711.36/x
3. Step 3: Cross multiply
   30,651.48x = 42,300.72 × 18,711.36
4. Step 4: Simplify right side
   30,651.48x = 791,504,000.18
5. Step 5: Solve for x
   x = 791,504,000.18/30,651.48
6. Step 6: Final answer
   x = 25,822.70