Finding the Fourth Proportional to 7,978.15, 11,972.69 and 2,784.02

Step by Step Solution

1. Step 1: Write the proportion equation
   7,978.15 : 11,972.69 = 2,784.02 : x
2. Step 2: Convert to fraction form
   7,978.15/11,972.69 = 2,784.02/x
3. Step 3: Cross multiply
   7,978.15x = 11,972.69 × 2,784.02
4. Step 4: Simplify right side
   7,978.15x = 33,332,234.87
5. Step 5: Solve for x
   x = 33,332,234.87/7,978.15
6. Step 6: Final answer
   x = 4,177.94