Finding the Fourth Proportional to 31,407.31, 43,345.77 and 18,660.59

Step by Step Solution

1. Step 1: Write the proportion equation
   31,407.31 : 43,345.77 = 18,660.59 : x
2. Step 2: Convert to fraction form
   31,407.31/43,345.77 = 18,660.59/x
3. Step 3: Cross multiply
   31,407.31x = 43,345.77 × 18,660.59
4. Step 4: Simplify right side
   31,407.31x = 808,857,866.83
5. Step 5: Solve for x
   x = 808,857,866.83/31,407.31
6. Step 6: Final answer
   x = 25,753.81