Finding the Fourth Proportional to 31,003.26, 42,784.92 and 16,856.07

Step by Step Solution

1. Step 1: Write the proportion equation
   31,003.26 : 42,784.92 = 16,856.07 : x
2. Step 2: Convert to fraction form
   31,003.26/42,784.92 = 16,856.07/x
3. Step 3: Cross multiply
   31,003.26x = 42,784.92 × 16,856.07
4. Step 4: Simplify right side
   31,003.26x = 721,185,606.46
5. Step 5: Solve for x
   x = 721,185,606.46/31,003.26
6. Step 6: Final answer
   x = 23,261.61