Finding the Fourth Proportional to 72,878.72, 109,515.72 and 39,623.36

Step by Step Solution

1. Step 1: Write the proportion equation
   72,878.72 : 109,515.72 = 39,623.36 : x
2. Step 2: Convert to fraction form
   72,878.72/109,515.72 = 39,623.36/x
3. Step 3: Cross multiply
   72,878.72x = 109,515.72 × 39,623.36
4. Step 4: Simplify right side
   72,878.72x = 4,339,380,799.22
5. Step 5: Solve for x
   x = 4,339,380,799.22/72,878.72
6. Step 6: Final answer
   x = 59,542.49