Finding the Fourth Proportional to 142,429.75, 213,645.09 and 53,659.42

Step by Step Solution

1. Step 1: Write the proportion equation
   142,429.75 : 213,645.09 = 53,659.42 : x
2. Step 2: Convert to fraction form
   142,429.75/213,645.09 = 53,659.42/x
3. Step 3: Cross multiply
   142,429.75x = 213,645.09 × 53,659.42
4. Step 4: Simplify right side
   142,429.75x = 11,464,071,615.25
5. Step 5: Solve for x
   x = 11,464,071,615.25/142,429.75
6. Step 6: Final answer
   x = 80,489.31