Finding the Fourth Proportional to 71,776.69, 99,050.52 and 39,945.31

Step by Step Solution

1. Step 1: Write the proportion equation
   71,776.69 : 99,050.52 = 39,945.31 : x
2. Step 2: Convert to fraction form
   71,776.69/99,050.52 = 39,945.31/x
3. Step 3: Cross multiply
   71,776.69x = 99,050.52 × 39,945.31
4. Step 4: Simplify right side
   71,776.69x = 3,956,603,727.06
5. Step 5: Solve for x
   x = 3,956,603,727.06/71,776.69
6. Step 6: Final answer
   x = 55,123.80