Finding the Fourth Proportional to 78,634.05, 117,380.96 and 72,780.42

Step by Step Solution

1. Step 1: Write the proportion equation
   78,634.05 : 117,380.96 = 72,780.42 : x
2. Step 2: Convert to fraction form
   78,634.05/117,380.96 = 72,780.42/x
3. Step 3: Cross multiply
   78,634.05x = 117,380.96 × 72,780.42
4. Step 4: Simplify right side
   78,634.05x = 8,543,034,981.90
5. Step 5: Solve for x
   x = 8,543,034,981.90/78,634.05
6. Step 6: Final answer
   x = 108,642.95