Finding the Fourth Proportional to 85,621.78, 118,271.02 and 65,724.54

Step by Step Solution

1. Step 1: Write the proportion equation
   85,621.78 : 118,271.02 = 65,724.54 : x
2. Step 2: Convert to fraction form
   85,621.78/118,271.02 = 65,724.54/x
3. Step 3: Cross multiply
   85,621.78x = 118,271.02 × 65,724.54
4. Step 4: Simplify right side
   85,621.78x = 7,773,308,384.83
5. Step 5: Solve for x
   x = 7,773,308,384.83/85,621.78
6. Step 6: Final answer
   x = 90,786.58