Finding the Fourth Proportional to 31,091.16, 42,903.72 and 18,343.68

Step by Step Solution

1. Step 1: Write the proportion equation
   31,091.16 : 42,903.72 = 18,343.68 : x
2. Step 2: Convert to fraction form
   31,091.16/42,903.72 = 18,343.68/x
3. Step 3: Cross multiply
   31,091.16x = 42,903.72 × 18,343.68
4. Step 4: Simplify right side
   31,091.16x = 787,012,110.49
5. Step 5: Solve for x
   x = 787,012,110.49/31,091.16
6. Step 6: Final answer
   x = 25,313.05