Finding the Fourth Proportional to 21,993.30, 30,878.10 and 21,993.30

Step by Step Solution

1. Step 1: Write the proportion equation
   21,993.30 : 30,878.10 = 21,993.30 : x
2. Step 2: Convert to fraction form
   21,993.30/30,878.10 = 21,993.30/x
3. Step 3: Cross multiply
   21,993.30x = 30,878.10 × 21,993.30
4. Step 4: Simplify right side
   21,993.30x = 679,111,316.73
5. Step 5: Solve for x
   x = 679,111,316.73/21,993.30
6. Step 6: Final answer
   x = 30,878.10