Finding the Fourth Proportional to 128,667.15, 177,535.40 and 72,067.59

Step by Step Solution

1. Step 1: Write the proportion equation
   128,667.15 : 177,535.40 = 72,067.59 : x
2. Step 2: Convert to fraction form
   128,667.15/177,535.40 = 72,067.59/x
3. Step 3: Cross multiply
   128,667.15x = 177,535.40 × 72,067.59
4. Step 4: Simplify right side
   128,667.15x = 12,794,548,057.35
5. Step 5: Solve for x
   x = 12,794,548,057.35/128,667.15
6. Step 6: Final answer
   x = 99,439.12