Finding the Fourth Proportional to 31,089.84, 42,918.30 and 18,338.69

Step by Step Solution

1. Step 1: Write the proportion equation
   31,089.84 : 42,918.30 = 18,338.69 : x
2. Step 2: Convert to fraction form
   31,089.84/42,918.30 = 18,338.69/x
3. Step 3: Cross multiply
   31,089.84x = 42,918.30 × 18,338.69
4. Step 4: Simplify right side
   31,089.84x = 787,065,184.44
5. Step 5: Solve for x
   x = 787,065,184.44/31,089.84
6. Step 6: Final answer
   x = 25,315.83