Finding the Fourth Proportional to 120,390.81, 166,141.06 and 69,402.59

Step by Step Solution

1. Step 1: Write the proportion equation
   120,390.81 : 166,141.06 = 69,402.59 : x
2. Step 2: Convert to fraction form
   120,390.81/166,141.06 = 69,402.59/x
3. Step 3: Cross multiply
   120,390.81x = 166,141.06 × 69,402.59
4. Step 4: Simplify right side
   120,390.81x = 11,530,619,488.16
5. Step 5: Solve for x
   x = 11,530,619,488.16/120,390.81
6. Step 6: Final answer
   x = 95,776.58