Finding the Fourth Proportional to 31,108.83, 46,682.60 and 12,640.83

Step by Step Solution

1. Step 1: Write the proportion equation
   31,108.83 : 46,682.60 = 12,640.83 : x
2. Step 2: Convert to fraction form
   31,108.83/46,682.60 = 12,640.83/x
3. Step 3: Cross multiply
   31,108.83x = 46,682.60 × 12,640.83
4. Step 4: Simplify right side
   31,108.83x = 590,106,810.56
5. Step 5: Solve for x
   x = 590,106,810.56/31,108.83
6. Step 6: Final answer
   x = 18,969.11