Finding the Fourth Proportional to 30,716.74, 42,388.68 and 17,978.68

Step by Step Solution

1. Step 1: Write the proportion equation
   30,716.74 : 42,388.68 = 17,978.68 : x
2. Step 2: Convert to fraction form
   30,716.74/42,388.68 = 17,978.68/x
3. Step 3: Cross multiply
   30,716.74x = 42,388.68 × 17,978.68
4. Step 4: Simplify right side
   30,716.74x = 762,092,513.34
5. Step 5: Solve for x
   x = 762,092,513.34/30,716.74
6. Step 6: Final answer
   x = 24,810.33