Finding the Fourth Proportional to 10,769.78, 16,155.55 and 2,978.60

Step by Step Solution

1. Step 1: Write the proportion equation
   10,769.78 : 16,155.55 = 2,978.60 : x
2. Step 2: Convert to fraction form
   10,769.78/16,155.55 = 2,978.60/x
3. Step 3: Cross multiply
   10,769.78x = 16,155.55 × 2,978.60
4. Step 4: Simplify right side
   10,769.78x = 48,120,844.18
5. Step 5: Solve for x
   x = 48,120,844.18/10,769.78
6. Step 6: Final answer
   x = 4,468.14