Finding the Fourth Proportional to 31,109.99, 42,938.49 and 18,358.43

Step by Step Solution

1. Step 1: Write the proportion equation
   31,109.99 : 42,938.49 = 18,358.43 : x
2. Step 2: Convert to fraction form
   31,109.99/42,938.49 = 18,358.43/x
3. Step 3: Cross multiply
   31,109.99x = 42,938.49 × 18,358.43
4. Step 4: Simplify right side
   31,109.99x = 788,283,262.97
5. Step 5: Solve for x
   x = 788,283,262.97/31,109.99
6. Step 6: Final answer
   x = 25,338.59