Finding the Fourth Proportional to 20,839.52, 31,296.18 and 19,978.46

Step by Step Solution

1. Step 1: Write the proportion equation
   20,839.52 : 31,296.18 = 19,978.46 : x
2. Step 2: Convert to fraction form
   20,839.52/31,296.18 = 19,978.46/x
3. Step 3: Cross multiply
   20,839.52x = 31,296.18 × 19,978.46
4. Step 4: Simplify right side
   20,839.52x = 625,249,480.28
5. Step 5: Solve for x
   x = 625,249,480.28/20,839.52
6. Step 6: Final answer
   x = 30,003.07