Finding the Fourth Proportional to 31,118.79, 46,647.81 and 12,393.21

Step by Step Solution

1. Step 1: Write the proportion equation
   31,118.79 : 46,647.81 = 12,393.21 : x
2. Step 2: Convert to fraction form
   31,118.79/46,647.81 = 12,393.21/x
3. Step 3: Cross multiply
   31,118.79x = 46,647.81 × 12,393.21
4. Step 4: Simplify right side
   31,118.79x = 578,116,105.37
5. Step 5: Solve for x
   x = 578,116,105.37/31,118.79
6. Step 6: Final answer
   x = 18,577.72