Finding the Fourth Proportional to 213,156.27, 319,734.45 and 108,005.31

Step by Step Solution

1. Step 1: Write the proportion equation
   213,156.27 : 319,734.45 = 108,005.31 : x
2. Step 2: Convert to fraction form
   213,156.27/319,734.45 = 108,005.31/x
3. Step 3: Cross multiply
   213,156.27x = 319,734.45 × 108,005.31
4. Step 4: Simplify right side
   213,156.27x = 34,533,018,389.93
5. Step 5: Solve for x
   x = 34,533,018,389.93/213,156.27
6. Step 6: Final answer
   x = 162,007.99