Finding the Fourth Proportional to 30,488.29, 42,074.46 and 18,388.71

Step by Step Solution

1. Step 1: Write the proportion equation
   30,488.29 : 42,074.46 = 18,388.71 : x
2. Step 2: Convert to fraction form
   30,488.29/42,074.46 = 18,388.71/x
3. Step 3: Cross multiply
   30,488.29x = 42,074.46 × 18,388.71
4. Step 4: Simplify right side
   30,488.29x = 773,695,043.35
5. Step 5: Solve for x
   x = 773,695,043.35/30,488.29
6. Step 6: Final answer
   x = 25,376.80