Finding the Fourth Proportional to 21,978.93, 30,331.47 and 13,024.98

Step by Step Solution

1. Step 1: Write the proportion equation
   21,978.93 : 30,331.47 = 13,024.98 : x
2. Step 2: Convert to fraction form
   21,978.93/30,331.47 = 13,024.98/x
3. Step 3: Cross multiply
   21,978.93x = 30,331.47 × 13,024.98
4. Step 4: Simplify right side
   21,978.93x = 395,066,790.12
5. Step 5: Solve for x
   x = 395,066,790.12/21,978.93
6. Step 6: Final answer
   x = 17,974.80