Finding the Fourth Proportional to 218,620.62, 301,697.46 and 123,128.91

Step by Step Solution

1. Step 1: Write the proportion equation
   218,620.62 : 301,697.46 = 123,128.91 : x
2. Step 2: Convert to fraction form
   218,620.62/301,697.46 = 123,128.91/x
3. Step 3: Cross multiply
   218,620.62x = 301,697.46 × 123,128.91
4. Step 4: Simplify right side
   218,620.62x = 37,147,679,399.57
5. Step 5: Solve for x
   x = 37,147,679,399.57/218,620.62
6. Step 6: Final answer
   x = 169,918.46