Finding the Fourth Proportional to 51,216.99, 70,684.10 and 31,078.98

Step by Step Solution

1. Step 1: Write the proportion equation
   51,216.99 : 70,684.10 = 31,078.98 : x
2. Step 2: Convert to fraction form
   51,216.99/70,684.10 = 31,078.98/x
3. Step 3: Cross multiply
   51,216.99x = 70,684.10 × 31,078.98
4. Step 4: Simplify right side
   51,216.99x = 2,196,789,574.82
5. Step 5: Solve for x
   x = 2,196,789,574.82/51,216.99
6. Step 6: Final answer
   x = 42,891.81