Finding the Fourth Proportional to 78,042.19, 107,697.39 and 42,231.40

Step by Step Solution

1. Step 1: Write the proportion equation
   78,042.19 : 107,697.39 = 42,231.40 : x
2. Step 2: Convert to fraction form
   78,042.19/107,697.39 = 42,231.40/x
3. Step 3: Cross multiply
   78,042.19x = 107,697.39 × 42,231.40
4. Step 4: Simplify right side
   78,042.19x = 4,548,211,556.05
5. Step 5: Solve for x
   x = 4,548,211,556.05/78,042.19
6. Step 6: Final answer
   x = 58,278.88