Finding the Fourth Proportional to 278,499.20, 417,770.87 and 78,820.83

Step by Step Solution

1. Step 1: Write the proportion equation
   278,499.20 : 417,770.87 = 78,820.83 : x
2. Step 2: Convert to fraction form
   278,499.20/417,770.87 = 78,820.83/x
3. Step 3: Cross multiply
   278,499.20x = 417,770.87 × 78,820.83
4. Step 4: Simplify right side
   278,499.20x = 32,929,046,329.12
5. Step 5: Solve for x
   x = 32,929,046,329.12/278,499.20
6. Step 6: Final answer
   x = 118,237.49