Finding the Fourth Proportional to 72,078.56, 99,457.98 and 43,778.78

Step by Step Solution

1. Step 1: Write the proportion equation
   72,078.56 : 99,457.98 = 43,778.78 : x
2. Step 2: Convert to fraction form
   72,078.56/99,457.98 = 43,778.78/x
3. Step 3: Cross multiply
   72,078.56x = 99,457.98 × 43,778.78
4. Step 4: Simplify right side
   72,078.56x = 4,354,149,025.66
5. Step 5: Solve for x
   x = 4,354,149,025.66/72,078.56
6. Step 6: Final answer
   x = 60,408.38