Finding the Fourth Proportional to 128,700.72, 192,936.25 and 65,485.49

Step by Step Solution

1. Step 1: Write the proportion equation
   128,700.72 : 192,936.25 = 65,485.49 : x
2. Step 2: Convert to fraction form
   128,700.72/192,936.25 = 65,485.49/x
3. Step 3: Cross multiply
   128,700.72x = 192,936.25 × 65,485.49
4. Step 4: Simplify right side
   128,700.72x = 12,634,523,741.62
5. Step 5: Solve for x
   x = 12,634,523,741.62/128,700.72
6. Step 6: Final answer
   x = 98,169.80