Finding the Fourth Proportional to 213,667.82, 320,383.40 and 87,396.72

Step by Step Solution

1. Step 1: Write the proportion equation
   213,667.82 : 320,383.40 = 87,396.72 : x
2. Step 2: Convert to fraction form
   213,667.82/320,383.40 = 87,396.72/x
3. Step 3: Cross multiply
   213,667.82x = 320,383.40 × 87,396.72
4. Step 4: Simplify right side
   213,667.82x = 28,000,458,957.79
5. Step 5: Solve for x
   x = 28,000,458,957.79/213,667.82
6. Step 6: Final answer
   x = 131,046.68