Finding the Fourth Proportional to 19,978.78, 29,981.54 and 8,292.01

Step by Step Solution

1. Step 1: Write the proportion equation
   19,978.78 : 29,981.54 = 8,292.01 : x
2. Step 2: Convert to fraction form
   19,978.78/29,981.54 = 8,292.01/x
3. Step 3: Cross multiply
   19,978.78x = 29,981.54 × 8,292.01
4. Step 4: Simplify right side
   19,978.78x = 248,607,175.27
5. Step 5: Solve for x
   x = 248,607,175.27/19,978.78
6. Step 6: Final answer
   x = 12,443.56