Finding the Fourth Proportional to 128,656.85, 192,985.72 and 91,103.33

Step by Step Solution

1. Step 1: Write the proportion equation
   128,656.85 : 192,985.72 = 91,103.33 : x
2. Step 2: Convert to fraction form
   128,656.85/192,985.72 = 91,103.33/x
3. Step 3: Cross multiply
   128,656.85x = 192,985.72 × 91,103.33
4. Step 4: Simplify right side
   128,656.85x = 17,581,641,989.15
5. Step 5: Solve for x
   x = 17,581,641,989.15/128,656.85
6. Step 6: Final answer
   x = 136,655.32