Finding the Fourth Proportional to 78,231.57, 107,959.41 and 42,421.47

Step by Step Solution

1. Step 1: Write the proportion equation
   78,231.57 : 107,959.41 = 42,421.47 : x
2. Step 2: Convert to fraction form
   78,231.57/107,959.41 = 42,421.47/x
3. Step 3: Cross multiply
   78,231.57x = 107,959.41 × 42,421.47
4. Step 4: Simplify right side
   78,231.57x = 4,579,796,872.53
5. Step 5: Solve for x
   x = 4,579,796,872.53/78,231.57
6. Step 6: Final answer
   x = 58,541.54