Finding the Fourth Proportional to 215,590, 323,139.76 and 131,164.07

Step by Step Solution

1. Step 1: Write the proportion equation
   215,590 : 323,139.76 = 131,164.07 : x
2. Step 2: Convert to fraction form
   215,590/323,139.76 = 131,164.07/x
3. Step 3: Cross multiply
   215,590x = 323,139.76 × 131,164.07
4. Step 4: Simplify right side
   215,590x = 42,384,326,100.42
5. Step 5: Solve for x
   x = 42,384,326,100.42/215,590
6. Step 6: Final answer
   x = 196,596.90