Finding the Fourth Proportional to 39,978.31, 55,170.78 and 22,072.25

Step by Step Solution

1. Step 1: Write the proportion equation
   39,978.31 : 55,170.78 = 22,072.25 : x
2. Step 2: Convert to fraction form
   39,978.31/55,170.78 = 22,072.25/x
3. Step 3: Cross multiply
   39,978.31x = 55,170.78 × 22,072.25
4. Step 4: Simplify right side
   39,978.31x = 1,217,743,248.86
5. Step 5: Solve for x
   x = 1,217,743,248.86/39,978.31
6. Step 6: Final answer
   x = 30,460.10