Finding the Fourth Proportional to 51,321.94, 70,821.57 and 28,964.50

Step by Step Solution

1. Step 1: Write the proportion equation
   51,321.94 : 70,821.57 = 28,964.50 : x
2. Step 2: Convert to fraction form
   51,321.94/70,821.57 = 28,964.50/x
3. Step 3: Cross multiply
   51,321.94x = 70,821.57 × 28,964.50
4. Step 4: Simplify right side
   51,321.94x = 2,051,311,364.27
5. Step 5: Solve for x
   x = 2,051,311,364.27/51,321.94
6. Step 6: Final answer
   x = 39,969.48