Finding the Fourth Proportional to 83,991.30, 126,035.55 and 31,406.10

Step by Step Solution

1. Step 1: Write the proportion equation
   83,991.30 : 126,035.55 = 31,406.10 : x
2. Step 2: Convert to fraction form
   83,991.30/126,035.55 = 31,406.10/x
3. Step 3: Cross multiply
   83,991.30x = 126,035.55 × 31,406.10
4. Step 4: Simplify right side
   83,991.30x = 3,958,285,086.86
5. Step 5: Solve for x
   x = 3,958,285,086.86/83,991.30
6. Step 6: Final answer
   x = 47,127.32