Finding the Fourth Proportional to 31,112.92, 42,950.28 and 18,361.90

Step by Step Solution

1. Step 1: Write the proportion equation
   31,112.92 : 42,950.28 = 18,361.90 : x
2. Step 2: Convert to fraction form
   31,112.92/42,950.28 = 18,361.90/x
3. Step 3: Cross multiply
   31,112.92x = 42,950.28 × 18,361.90
4. Step 4: Simplify right side
   31,112.92x = 788,648,746.33
5. Step 5: Solve for x
   x = 788,648,746.33/31,112.92
6. Step 6: Final answer
   x = 25,347.95