Finding the Fourth Proportional to 39,915.72, 55,085.94 and 22,919.90

Step by Step Solution

1. Step 1: Write the proportion equation
   39,915.72 : 55,085.94 = 22,919.90 : x
2. Step 2: Convert to fraction form
   39,915.72/55,085.94 = 22,919.90/x
3. Step 3: Cross multiply
   39,915.72x = 55,085.94 × 22,919.90
4. Step 4: Simplify right side
   39,915.72x = 1,262,563,960.78
5. Step 5: Solve for x
   x = 1,262,563,960.78/39,915.72
6. Step 6: Final answer
   x = 31,630.74