Finding the Fourth Proportional to 9,856.80, 14,783.52 and 4,921.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,856.80 : 14,783.52 = 4,921.20 : x
2. Step 2: Convert to fraction form
   9,856.80/14,783.52 = 4,921.20/x
3. Step 3: Cross multiply
   9,856.80x = 14,783.52 × 4,921.20
4. Step 4: Simplify right side
   9,856.80x = 72,752,658.62
5. Step 5: Solve for x
   x = 72,752,658.62/9,856.80
6. Step 6: Final answer
   x = 7,380.96