Finding the Fourth Proportional to 84,380.76, 126,087.72 and 64,278.72

Step by Step Solution

1. Step 1: Write the proportion equation
   84,380.76 : 126,087.72 = 64,278.72 : x
2. Step 2: Convert to fraction form
   84,380.76/126,087.72 = 64,278.72/x
3. Step 3: Cross multiply
   84,380.76x = 126,087.72 × 64,278.72
4. Step 4: Simplify right side
   84,380.76x = 8,104,757,249.32
5. Step 5: Solve for x
   x = 8,104,757,249.32/84,380.76
6. Step 6: Final answer
   x = 96,049.83