Finding the Fourth Proportional to 78,978.80, 118,237.80 and 76,674.80

Step by Step Solution

1. Step 1: Write the proportion equation
   78,978.80 : 118,237.80 = 76,674.80 : x
2. Step 2: Convert to fraction form
   78,978.80/118,237.80 = 76,674.80/x
3. Step 3: Cross multiply
   78,978.80x = 118,237.80 × 76,674.80
4. Step 4: Simplify right side
   78,978.80x = 9,065,859,667.44
5. Step 5: Solve for x
   x = 9,065,859,667.44/78,978.80
6. Step 6: Final answer
   x = 114,788.52