Finding the Fourth Proportional to 231,991.42, 320,148.09 and 131,389.42

Step by Step Solution

1. Step 1: Write the proportion equation
   231,991.42 : 320,148.09 = 131,389.42 : x
2. Step 2: Convert to fraction form
   231,991.42/320,148.09 = 131,389.42/x
3. Step 3: Cross multiply
   231,991.42x = 320,148.09 × 131,389.42
4. Step 4: Simplify right side
   231,991.42x = 42,064,071,859.21
5. Step 5: Solve for x
   x = 42,064,071,859.21/231,991.42
6. Step 6: Final answer
   x = 181,317.36