Finding the Fourth Proportional to 39,872.25, 55,025.06 and 21,968.55

Step by Step Solution

1. Step 1: Write the proportion equation
   39,872.25 : 55,025.06 = 21,968.55 : x
2. Step 2: Convert to fraction form
   39,872.25/55,025.06 = 21,968.55/x
3. Step 3: Cross multiply
   39,872.25x = 55,025.06 × 21,968.55
4. Step 4: Simplify right side
   39,872.25x = 1,208,820,672.02
5. Step 5: Solve for x
   x = 1,208,820,672.02/39,872.25
6. Step 6: Final answer
   x = 30,317.34