Finding the Fourth Proportional to 30,780.47, 42,474.50 and 17,355.02

Step by Step Solution

1. Step 1: Write the proportion equation
   30,780.47 : 42,474.50 = 17,355.02 : x
2. Step 2: Convert to fraction form
   30,780.47/42,474.50 = 17,355.02/x
3. Step 3: Cross multiply
   30,780.47x = 42,474.50 × 17,355.02
4. Step 4: Simplify right side
   30,780.47x = 737,145,796.99
5. Step 5: Solve for x
   x = 737,145,796.99/30,780.47
6. Step 6: Final answer
   x = 23,948.49