Finding the Fourth Proportional to 85,760.34, 128,718.96 and 43,669.50

Step by Step Solution

1. Step 1: Write the proportion equation
   85,760.34 : 128,718.96 = 43,669.50 : x
2. Step 2: Convert to fraction form
   85,760.34/128,718.96 = 43,669.50/x
3. Step 3: Cross multiply
   85,760.34x = 128,718.96 × 43,669.50
4. Step 4: Simplify right side
   85,760.34x = 5,621,092,623.72
5. Step 5: Solve for x
   x = 5,621,092,623.72/85,760.34
6. Step 6: Final answer
   x = 65,544.20