Finding the Fourth Proportional to 31,060.49, 42,857.78 and 18,317.68

Step by Step Solution

1. Step 1: Write the proportion equation
   31,060.49 : 42,857.78 = 18,317.68 : x
2. Step 2: Convert to fraction form
   31,060.49/42,857.78 = 18,317.68/x
3. Step 3: Cross multiply
   31,060.49x = 42,857.78 × 18,317.68
4. Step 4: Simplify right side
   31,060.49x = 785,054,900.82
5. Step 5: Solve for x
   x = 785,054,900.82/31,060.49
6. Step 6: Final answer
   x = 25,275.04