Finding the Fourth Proportional to 312,085.91, 431,119.46 and 248,342.15

Step by Step Solution

1. Step 1: Write the proportion equation
   312,085.91 : 431,119.46 = 248,342.15 : x
2. Step 2: Convert to fraction form
   312,085.91/431,119.46 = 248,342.15/x
3. Step 3: Cross multiply
   312,085.91x = 431,119.46 × 248,342.15
4. Step 4: Simplify right side
   312,085.91x = 107,065,132,361.53
5. Step 5: Solve for x
   x = 107,065,132,361.53/312,085.91
6. Step 6: Final answer
   x = 343,063.01