Finding the Fourth Proportional to 78,231.72, 107,959.50 and 42,421.64

Step by Step Solution

1. Step 1: Write the proportion equation
   78,231.72 : 107,959.50 = 42,421.64 : x
2. Step 2: Convert to fraction form
   78,231.72/107,959.50 = 42,421.64/x
3. Step 3: Cross multiply
   78,231.72x = 107,959.50 × 42,421.64
4. Step 4: Simplify right side
   78,231.72x = 4,579,819,043.58
5. Step 5: Solve for x
   x = 4,579,819,043.58/78,231.72
6. Step 6: Final answer
   x = 58,541.71