Finding the Fourth Proportional to 19,978.72, 29,981.44 and 8,291.94

Step by Step Solution

1. Step 1: Write the proportion equation
   19,978.72 : 29,981.44 = 8,291.94 : x
2. Step 2: Convert to fraction form
   19,978.72/29,981.44 = 8,291.94/x
3. Step 3: Cross multiply
   19,978.72x = 29,981.44 × 8,291.94
4. Step 4: Simplify right side
   19,978.72x = 248,604,301.59
5. Step 5: Solve for x
   x = 248,604,301.59/19,978.72
6. Step 6: Final answer
   x = 12,443.45