Finding the Fourth Proportional to 120,385.69, 166,131.90 and 69,398.12

Step by Step Solution

1. Step 1: Write the proportion equation
   120,385.69 : 166,131.90 = 69,398.12 : x
2. Step 2: Convert to fraction form
   120,385.69/166,131.90 = 69,398.12/x
3. Step 3: Cross multiply
   120,385.69x = 166,131.90 × 69,398.12
4. Step 4: Simplify right side
   120,385.69x = 11,529,241,947.36
5. Step 5: Solve for x
   x = 11,529,241,947.36/120,385.69
6. Step 6: Final answer
   x = 95,769.21