Finding the Fourth Proportional to 9,991.72, 14,977.78 and 4,794.76

Step by Step Solution

1. Step 1: Write the proportion equation
   9,991.72 : 14,977.78 = 4,794.76 : x
2. Step 2: Convert to fraction form
   9,991.72/14,977.78 = 4,794.76/x
3. Step 3: Cross multiply
   9,991.72x = 14,977.78 × 4,794.76
4. Step 4: Simplify right side
   9,991.72x = 71,814,860.43
5. Step 5: Solve for x
   x = 71,814,860.43/9,991.72
6. Step 6: Final answer
   x = 7,187.44