Finding the Fourth Proportional to 142,016.13, 213,053.36 and 57,776.09

Step by Step Solution

1. Step 1: Write the proportion equation
   142,016.13 : 213,053.36 = 57,776.09 : x
2. Step 2: Convert to fraction form
   142,016.13/213,053.36 = 57,776.09/x
3. Step 3: Cross multiply
   142,016.13x = 213,053.36 × 57,776.09
4. Step 4: Simplify right side
   142,016.13x = 12,309,388,748.02
5. Step 5: Solve for x
   x = 12,309,388,748.02/142,016.13
6. Step 6: Final answer
   x = 86,675.99