Finding the Fourth Proportional to 78,479.78, 108,301.55 and 42,669.80

Step by Step Solution

1. Step 1: Write the proportion equation
   78,479.78 : 108,301.55 = 42,669.80 : x
2. Step 2: Convert to fraction form
   78,479.78/108,301.55 = 42,669.80/x
3. Step 3: Cross multiply
   78,479.78x = 108,301.55 × 42,669.80
4. Step 4: Simplify right side
   78,479.78x = 4,621,204,994.09
5. Step 5: Solve for x
   x = 4,621,204,994.09/78,479.78
6. Step 6: Final answer
   x = 58,884.02