Finding the Fourth Proportional to 86,991.72, 120,046.54 and 51,184.05

Step by Step Solution

1. Step 1: Write the proportion equation
   86,991.72 : 120,046.54 = 51,184.05 : x
2. Step 2: Convert to fraction form
   86,991.72/120,046.54 = 51,184.05/x
3. Step 3: Cross multiply
   86,991.72x = 120,046.54 × 51,184.05
4. Step 4: Simplify right side
   86,991.72x = 6,144,468,105.69
5. Step 5: Solve for x
   x = 6,144,468,105.69/86,991.72
6. Step 6: Final answer
   x = 70,632.79