Finding the Fourth Proportional to 78,055.58, 107,716.85 and 42,245.90

Step by Step Solution

1. Step 1: Write the proportion equation
   78,055.58 : 107,716.85 = 42,245.90 : x
2. Step 2: Convert to fraction form
   78,055.58/107,716.85 = 42,245.90/x
3. Step 3: Cross multiply
   78,055.58x = 107,716.85 × 42,245.90
4. Step 4: Simplify right side
   78,055.58x = 4,550,595,273.42
5. Step 5: Solve for x
   x = 4,550,595,273.42/78,055.58
6. Step 6: Final answer
   x = 58,299.42