Finding the Fourth Proportional to 31,012.88, 46,519.77 and 7,639.31

Step by Step Solution

1. Step 1: Write the proportion equation
   31,012.88 : 46,519.77 = 7,639.31 : x
2. Step 2: Convert to fraction form
   31,012.88/46,519.77 = 7,639.31/x
3. Step 3: Cross multiply
   31,012.88x = 46,519.77 × 7,639.31
4. Step 4: Simplify right side
   31,012.88x = 355,379,046.13
5. Step 5: Solve for x
   x = 355,379,046.13/31,012.88
6. Step 6: Final answer
   x = 11,459.08