Finding the Fourth Proportional to 31,085.87, 42,904.10 and 18,338.29

Step by Step Solution

1. Step 1: Write the proportion equation
   31,085.87 : 42,904.10 = 18,338.29 : x
2. Step 2: Convert to fraction form
   31,085.87/42,904.10 = 18,338.29/x
3. Step 3: Cross multiply
   31,085.87x = 42,904.10 × 18,338.29
4. Step 4: Simplify right side
   31,085.87x = 786,787,827.99
5. Step 5: Solve for x
   x = 786,787,827.99/31,085.87
6. Step 6: Final answer
   x = 25,310.14