Finding the Fourth Proportional to 9,377.02, 12,928.17 and 7,777.81

Step by Step Solution

1. Step 1: Write the proportion equation
   9,377.02 : 12,928.17 = 7,777.81 : x
2. Step 2: Convert to fraction form
   9,377.02/12,928.17 = 7,777.81/x
3. Step 3: Cross multiply
   9,377.02x = 12,928.17 × 7,777.81
4. Step 4: Simplify right side
   9,377.02x = 100,552,849.91
5. Step 5: Solve for x
   x = 100,552,849.91/9,377.02
6. Step 6: Final answer
   x = 10,723.33