Finding the Fourth Proportional to 8,643.46, 12,978.16 and 4,949.86

Step by Step Solution

1. Step 1: Write the proportion equation
   8,643.46 : 12,978.16 = 4,949.86 : x
2. Step 2: Convert to fraction form
   8,643.46/12,978.16 = 4,949.86/x
3. Step 3: Cross multiply
   8,643.46x = 12,978.16 × 4,949.86
4. Step 4: Simplify right side
   8,643.46x = 64,240,075.06
5. Step 5: Solve for x
   x = 64,240,075.06/8,643.46
6. Step 6: Final answer
   x = 7,432.22