Finding the Fourth Proportional to 39,872.48, 55,026.50 and 21,967.47

Step by Step Solution

1. Step 1: Write the proportion equation
   39,872.48 : 55,026.50 = 21,967.47 : x
2. Step 2: Convert to fraction form
   39,872.48/55,026.50 = 21,967.47/x
3. Step 3: Cross multiply
   39,872.48x = 55,026.50 × 21,967.47
4. Step 4: Simplify right side
   39,872.48x = 1,208,792,878.12
5. Step 5: Solve for x
   x = 1,208,792,878.12/39,872.48
6. Step 6: Final answer
   x = 30,316.47