Finding the Fourth Proportional to 31,105.35, 42,909.78 and 19,756.34

Step by Step Solution

1. Step 1: Write the proportion equation
   31,105.35 : 42,909.78 = 19,756.34 : x
2. Step 2: Convert to fraction form
   31,105.35/42,909.78 = 19,756.34/x
3. Step 3: Cross multiply
   31,105.35x = 42,909.78 × 19,756.34
4. Step 4: Simplify right side
   31,105.35x = 847,740,223.45
5. Step 5: Solve for x
   x = 847,740,223.45/31,105.35
6. Step 6: Final answer
   x = 27,253.84