Finding the Fourth Proportional to 8,911.90, 12,298.24 and 4,932.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,911.90 : 12,298.24 = 4,932.78 : x
2. Step 2: Convert to fraction form
   8,911.90/12,298.24 = 4,932.78/x
3. Step 3: Cross multiply
   8,911.90x = 12,298.24 × 4,932.78
4. Step 4: Simplify right side
   8,911.90x = 60,664,512.31
5. Step 5: Solve for x
   x = 60,664,512.31/8,911.90
6. Step 6: Final answer
   x = 6,807.14