Finding the Fourth Proportional to 30,722.49, 42,397.05 and 17,978.13

Step by Step Solution

1. Step 1: Write the proportion equation
   30,722.49 : 42,397.05 = 17,978.13 : x
2. Step 2: Convert to fraction form
   30,722.49/42,397.05 = 17,978.13/x
3. Step 3: Cross multiply
   30,722.49x = 42,397.05 × 17,978.13
4. Step 4: Simplify right side
   30,722.49x = 762,219,464.53
5. Step 5: Solve for x
   x = 762,219,464.53/30,722.49
6. Step 6: Final answer
   x = 24,809.82