Finding the Fourth Proportional to 78,108.30, 107,789.45 and 42,298.31

Step by Step Solution

1. Step 1: Write the proportion equation
   78,108.30 : 107,789.45 = 42,298.31 : x
2. Step 2: Convert to fraction form
   78,108.30/107,789.45 = 42,298.31/x
3. Step 3: Cross multiply
   78,108.30x = 107,789.45 × 42,298.31
4. Step 4: Simplify right side
   78,108.30x = 4,559,311,031.88
5. Step 5: Solve for x
   x = 4,559,311,031.88/78,108.30
6. Step 6: Final answer
   x = 58,371.66