Finding the Fourth Proportional to 30,875.99, 42,610.97 and 18,781.20

Step by Step Solution

1. Step 1: Write the proportion equation
   30,875.99 : 42,610.97 = 18,781.20 : x
2. Step 2: Convert to fraction form
   30,875.99/42,610.97 = 18,781.20/x
3. Step 3: Cross multiply
   30,875.99x = 42,610.97 × 18,781.20
4. Step 4: Simplify right side
   30,875.99x = 800,285,196.72
5. Step 5: Solve for x
   x = 800,285,196.72/30,875.99
6. Step 6: Final answer
   x = 25,919.34