Finding the Fourth Proportional to 128,563.43, 177,415.58 and 71,976.83

Step by Step Solution

1. Step 1: Write the proportion equation
   128,563.43 : 177,415.58 = 71,976.83 : x
2. Step 2: Convert to fraction form
   128,563.43/177,415.58 = 71,976.83/x
3. Step 3: Cross multiply
   128,563.43x = 177,415.58 × 71,976.83
4. Step 4: Simplify right side
   128,563.43x = 12,769,810,333.88
5. Step 5: Solve for x
   x = 12,769,810,333.88/128,563.43
6. Step 6: Final answer
   x = 99,326.93