Finding the Fourth Proportional to 71,779.56, 99,053.71 and 39,947.77

Step by Step Solution

1. Step 1: Write the proportion equation
   71,779.56 : 99,053.71 = 39,947.77 : x
2. Step 2: Convert to fraction form
   71,779.56/99,053.71 = 39,947.77/x
3. Step 3: Cross multiply
   71,779.56x = 99,053.71 × 39,947.77
4. Step 4: Simplify right side
   71,779.56x = 3,956,974,824.73
5. Step 5: Solve for x
   x = 3,956,974,824.73/71,779.56
6. Step 6: Final answer
   x = 55,126.76