Finding the Fourth Proportional to 31,089.18, 42,917.46 and 18,338.06

Step by Step Solution

1. Step 1: Write the proportion equation
   31,089.18 : 42,917.46 = 18,338.06 : x
2. Step 2: Convert to fraction form
   31,089.18/42,917.46 = 18,338.06/x
3. Step 3: Cross multiply
   31,089.18x = 42,917.46 × 18,338.06
4. Step 4: Simplify right side
   31,089.18x = 787,022,956.53
5. Step 5: Solve for x
   x = 787,022,956.53/31,089.18
6. Step 6: Final answer
   x = 25,315.01