Finding the Fourth Proportional to 78,478.20, 108,300.15 and 42,668.35

Step by Step Solution

1. Step 1: Write the proportion equation
   78,478.20 : 108,300.15 = 42,668.35 : x
2. Step 2: Convert to fraction form
   78,478.20/108,300.15 = 42,668.35/x
3. Step 3: Cross multiply
   78,478.20x = 108,300.15 × 42,668.35
4. Step 4: Simplify right side
   78,478.20x = 4,620,988,434.50
5. Step 5: Solve for x
   x = 4,620,988,434.50/78,478.20
6. Step 6: Final answer
   x = 58,882.45