Finding the Fourth Proportional to 51,621.91, 71,238.72 and 28,961.38

Step by Step Solution

1. Step 1: Write the proportion equation
   51,621.91 : 71,238.72 = 28,961.38 : x
2. Step 2: Convert to fraction form
   51,621.91/71,238.72 = 28,961.38/x
3. Step 3: Cross multiply
   51,621.91x = 71,238.72 × 28,961.38
4. Step 4: Simplify right side
   51,621.91x = 2,063,171,838.29
5. Step 5: Solve for x
   x = 2,063,171,838.29/51,621.91
6. Step 6: Final answer
   x = 39,966.98