Finding the Fourth Proportional to 128,759.98, 177,622.72 and 77,744.56

Step by Step Solution

1. Step 1: Write the proportion equation
   128,759.98 : 177,622.72 = 77,744.56 : x
2. Step 2: Convert to fraction form
   128,759.98/177,622.72 = 77,744.56/x
3. Step 3: Cross multiply
   128,759.98x = 177,622.72 × 77,744.56
4. Step 4: Simplify right side
   128,759.98x = 13,809,200,212.40
5. Step 5: Solve for x
   x = 13,809,200,212.40/128,759.98
6. Step 6: Final answer
   x = 107,247.61