Finding the Fourth Proportional to 142,196.09, 213,051.36 and 78,207.79

Step by Step Solution

1. Step 1: Write the proportion equation
   142,196.09 : 213,051.36 = 78,207.79 : x
2. Step 2: Convert to fraction form
   142,196.09/213,051.36 = 78,207.79/x
3. Step 3: Cross multiply
   142,196.09x = 213,051.36 × 78,207.79
4. Step 4: Simplify right side
   142,196.09x = 16,662,275,742.30
5. Step 5: Solve for x
   x = 16,662,275,742.30/142,196.09
6. Step 6: Final answer
   x = 117,178.16