Finding the Fourth Proportional to 91,401.50, 126,135.78 and 51,119.72

Step by Step Solution

1. Step 1: Write the proportion equation
   91,401.50 : 126,135.78 = 51,119.72 : x
2. Step 2: Convert to fraction form
   91,401.50/126,135.78 = 51,119.72/x
3. Step 3: Cross multiply
   91,401.50x = 126,135.78 × 51,119.72
4. Step 4: Simplify right side
   91,401.50x = 6,448,025,755.58
5. Step 5: Solve for x
   x = 6,448,025,755.58/91,401.50
6. Step 6: Final answer
   x = 70,546.17