Finding the Fourth Proportional to 117,760, 162,508.80 and 64,768

Step by Step Solution

1. Step 1: Write the proportion equation
   117,760 : 162,508.80 = 64,768 : x
2. Step 2: Convert to fraction form
   117,760/162,508.80 = 64,768/x
3. Step 3: Cross multiply
   117,760x = 162,508.80 × 64,768
4. Step 4: Simplify right side
   117,760x = 10,525,369,958.40
5. Step 5: Solve for x
   x = 10,525,369,958.40/117,760
6. Step 6: Final answer
   x = 89,379.84