Finding the Fourth Proportional to 78,478.80, 108,300.90 and 42,668.79

Step by Step Solution

1. Step 1: Write the proportion equation
   78,478.80 : 108,300.90 = 42,668.79 : x
2. Step 2: Convert to fraction form
   78,478.80/108,300.90 = 42,668.79/x
3. Step 3: Cross multiply
   78,478.80x = 108,300.90 × 42,668.79
4. Step 4: Simplify right side
   78,478.80x = 4,621,067,817.41
5. Step 5: Solve for x
   x = 4,621,067,817.41/78,478.80
6. Step 6: Final answer
   x = 58,883.01