Finding the Fourth Proportional to 121,665.05, 166,678.32 and 117,116.55

Step by Step Solution

1. Step 1: Write the proportion equation
   121,665.05 : 166,678.32 = 117,116.55 : x
2. Step 2: Convert to fraction form
   121,665.05/166,678.32 = 117,116.55/x
3. Step 3: Cross multiply
   121,665.05x = 166,678.32 × 117,116.55
4. Step 4: Simplify right side
   121,665.05x = 19,520,789,798.20
5. Step 5: Solve for x
   x = 19,520,789,798.20/121,665.05
6. Step 6: Final answer
   x = 160,446.99