Finding the Fourth Proportional to 39,915.42, 55,086.98 and 22,921.89

Step by Step Solution

1. Step 1: Write the proportion equation
   39,915.42 : 55,086.98 = 22,921.89 : x
2. Step 2: Convert to fraction form
   39,915.42/55,086.98 = 22,921.89/x
3. Step 3: Cross multiply
   39,915.42x = 55,086.98 × 22,921.89
4. Step 4: Simplify right side
   39,915.42x = 1,262,697,581.38
5. Step 5: Solve for x
   x = 1,262,697,581.38/39,915.42
6. Step 6: Final answer
   x = 31,634.33