Finding the Fourth Proportional to 39,897.38, 55,057.34 and 21,992.46

Step by Step Solution

1. Step 1: Write the proportion equation
   39,897.38 : 55,057.34 = 21,992.46 : x
2. Step 2: Convert to fraction form
   39,897.38/55,057.34 = 21,992.46/x
3. Step 3: Cross multiply
   39,897.38x = 55,057.34 × 21,992.46
4. Step 4: Simplify right side
   39,897.38x = 1,210,845,962.41
5. Step 5: Solve for x
   x = 1,210,845,962.41/39,897.38
6. Step 6: Final answer
   x = 30,349.01