Finding the Fourth Proportional to 117,138.80, 161,648.57 and 65,456.34

Step by Step Solution

1. Step 1: Write the proportion equation
   117,138.80 : 161,648.57 = 65,456.34 : x
2. Step 2: Convert to fraction form
   117,138.80/161,648.57 = 65,456.34/x
3. Step 3: Cross multiply
   117,138.80x = 161,648.57 × 65,456.34
4. Step 4: Simplify right side
   117,138.80x = 10,580,923,758.43
5. Step 5: Solve for x
   x = 10,580,923,758.43/117,138.80
6. Step 6: Final answer
   x = 90,328.09