Finding the Fourth Proportional to 31,003.07, 42,782.42 and 16,855.79

Step by Step Solution

1. Step 1: Write the proportion equation
   31,003.07 : 42,782.42 = 16,855.79 : x
2. Step 2: Convert to fraction form
   31,003.07/42,782.42 = 16,855.79/x
3. Step 3: Cross multiply
   31,003.07x = 42,782.42 × 16,855.79
4. Step 4: Simplify right side
   31,003.07x = 721,131,189.02
5. Step 5: Solve for x
   x = 721,131,189.02/31,003.07
6. Step 6: Final answer
   x = 23,260.00