Finding the Fourth Proportional to 116,789.50, 161,169.69 and 66,488.50

Step by Step Solution

1. Step 1: Write the proportion equation
   116,789.50 : 161,169.69 = 66,488.50 : x
2. Step 2: Convert to fraction form
   116,789.50/161,169.69 = 66,488.50/x
3. Step 3: Cross multiply
   116,789.50x = 161,169.69 × 66,488.50
4. Step 4: Simplify right side
   116,789.50x = 10,715,930,933.57
5. Step 5: Solve for x
   x = 10,715,930,933.57/116,789.50
6. Step 6: Final answer
   x = 91,754.23