Finding the Fourth Proportional to 30,710.48, 42,387.40 and 21,748.56

Step by Step Solution

1. Step 1: Write the proportion equation
   30,710.48 : 42,387.40 = 21,748.56 : x
2. Step 2: Convert to fraction form
   30,710.48/42,387.40 = 21,748.56/x
3. Step 3: Cross multiply
   30,710.48x = 42,387.40 × 21,748.56
4. Step 4: Simplify right side
   30,710.48x = 921,864,912.14
5. Step 5: Solve for x
   x = 921,864,912.14/30,710.48
6. Step 6: Final answer
   x = 30,017.93