Finding the Fourth Proportional to 31,107.30, 42,915.82 and 19,149.86

Step by Step Solution

1. Step 1: Write the proportion equation
   31,107.30 : 42,915.82 = 19,149.86 : x
2. Step 2: Convert to fraction form
   31,107.30/42,915.82 = 19,149.86/x
3. Step 3: Cross multiply
   31,107.30x = 42,915.82 × 19,149.86
4. Step 4: Simplify right side
   31,107.30x = 821,831,944.79
5. Step 5: Solve for x
   x = 821,831,944.79/31,107.30
6. Step 6: Final answer
   x = 26,419.26