Finding the Fourth Proportional to 30,807.81, 42,519.16 and 17,380.30

Step by Step Solution

1. Step 1: Write the proportion equation
   30,807.81 : 42,519.16 = 17,380.30 : x
2. Step 2: Convert to fraction form
   30,807.81/42,519.16 = 17,380.30/x
3. Step 3: Cross multiply
   30,807.81x = 42,519.16 × 17,380.30
4. Step 4: Simplify right side
   30,807.81x = 738,995,756.55
5. Step 5: Solve for x
   x = 738,995,756.55/30,807.81
6. Step 6: Final answer
   x = 23,987.29