Finding the Fourth Proportional to 20,801.30, 31,137.15 and 12,010.10

Step by Step Solution

1. Step 1: Write the proportion equation
   20,801.30 : 31,137.15 = 12,010.10 : x
2. Step 2: Convert to fraction form
   20,801.30/31,137.15 = 12,010.10/x
3. Step 3: Cross multiply
   20,801.30x = 31,137.15 × 12,010.10
4. Step 4: Simplify right side
   20,801.30x = 373,960,285.22
5. Step 5: Solve for x
   x = 373,960,285.22/20,801.30
6. Step 6: Final answer
   x = 17,977.74