Finding the Fourth Proportional to 215,454.37, 323,181.20 and 215,142.72

Step by Step Solution

1. Step 1: Write the proportion equation
   215,454.37 : 323,181.20 = 215,142.72 : x
2. Step 2: Convert to fraction form
   215,454.37/323,181.20 = 215,142.72/x
3. Step 3: Cross multiply
   215,454.37x = 323,181.20 × 215,142.72
4. Step 4: Simplify right side
   215,454.37x = 69,530,082,958.72
5. Step 5: Solve for x
   x = 69,530,082,958.72/215,454.37
6. Step 6: Final answer
   x = 322,713.73