Finding the Fourth Proportional to 120,978.92, 166,939.50 and 69,983.48

Step by Step Solution

1. Step 1: Write the proportion equation
   120,978.92 : 166,939.50 = 69,983.48 : x
2. Step 2: Convert to fraction form
   120,978.92/166,939.50 = 69,983.48/x
3. Step 3: Cross multiply
   120,978.92x = 166,939.50 × 69,983.48
4. Step 4: Simplify right side
   120,978.92x = 11,683,007,159.46
5. Step 5: Solve for x
   x = 11,683,007,159.46/120,978.92
6. Step 6: Final answer
   x = 96,570.60