Finding the Fourth Proportional to 42,878.72, 64,416.90 and 41,107.28

Step by Step Solution

1. Step 1: Write the proportion equation
   42,878.72 : 64,416.90 = 41,107.28 : x
2. Step 2: Convert to fraction form
   42,878.72/64,416.90 = 41,107.28/x
3. Step 3: Cross multiply
   42,878.72x = 64,416.90 × 41,107.28
4. Step 4: Simplify right side
   42,878.72x = 2,648,003,545.03
5. Step 5: Solve for x
   x = 2,648,003,545.03/42,878.72
6. Step 6: Final answer
   x = 61,755.66