Finding the Fourth Proportional to 78,131.43, 107,821.31 and 42,321.38

Step by Step Solution

1. Step 1: Write the proportion equation
   78,131.43 : 107,821.31 = 42,321.38 : x
2. Step 2: Convert to fraction form
   78,131.43/107,821.31 = 42,321.38/x
3. Step 3: Cross multiply
   78,131.43x = 107,821.31 × 42,321.38
4. Step 4: Simplify right side
   78,131.43x = 4,563,145,881.89
5. Step 5: Solve for x
   x = 4,563,145,881.89/78,131.43
6. Step 6: Final answer
   x = 58,403.46