Finding the Fourth Proportional to 78,742.74, 108,709.20 and 54,578.82

Step by Step Solution

1. Step 1: Write the proportion equation
   78,742.74 : 108,709.20 = 54,578.82 : x
2. Step 2: Convert to fraction form
   78,742.74/108,709.20 = 54,578.82/x
3. Step 3: Cross multiply
   78,742.74x = 108,709.20 × 54,578.82
4. Step 4: Simplify right side
   78,742.74x = 5,933,219,859.14
5. Step 5: Solve for x
   x = 5,933,219,859.14/78,742.74
6. Step 6: Final answer
   x = 75,349.42