Finding the Fourth Proportional to 31,091.11, 42,911.24 and 18,343.53

Step by Step Solution

1. Step 1: Write the proportion equation
   31,091.11 : 42,911.24 = 18,343.53 : x
2. Step 2: Convert to fraction form
   31,091.11/42,911.24 = 18,343.53/x
3. Step 3: Cross multiply
   31,091.11x = 42,911.24 × 18,343.53
4. Step 4: Simplify right side
   31,091.11x = 787,143,526.56
5. Step 5: Solve for x
   x = 787,143,526.56/31,091.11
6. Step 6: Final answer
   x = 25,317.32