Finding the Fourth Proportional to 31,810.82, 47,721.82 and 12,091.10

Step by Step Solution

1. Step 1: Write the proportion equation
   31,810.82 : 47,721.82 = 12,091.10 : x
2. Step 2: Convert to fraction form
   31,810.82/47,721.82 = 12,091.10/x
3. Step 3: Cross multiply
   31,810.82x = 47,721.82 × 12,091.10
4. Step 4: Simplify right side
   31,810.82x = 577,009,297.80
5. Step 5: Solve for x
   x = 577,009,297.80/31,810.82
6. Step 6: Final answer
   x = 18,138.77