Finding the Fourth Proportional to 117,839.80, 162,622.34 and 64,128.28

Step by Step Solution

1. Step 1: Write the proportion equation
   117,839.80 : 162,622.34 = 64,128.28 : x
2. Step 2: Convert to fraction form
   117,839.80/162,622.34 = 64,128.28/x
3. Step 3: Cross multiply
   117,839.80x = 162,622.34 × 64,128.28
4. Step 4: Simplify right side
   117,839.80x = 10,428,690,707.54
5. Step 5: Solve for x
   x = 10,428,690,707.54/117,839.80
6. Step 6: Final answer
   x = 88,498.89