Finding the Fourth Proportional to 12,811.16, 17,674.47 and 7,773.57

Step by Step Solution

1. Step 1: Write the proportion equation
   12,811.16 : 17,674.47 = 7,773.57 : x
2. Step 2: Convert to fraction form
   12,811.16/17,674.47 = 7,773.57/x
3. Step 3: Cross multiply
   12,811.16x = 17,674.47 × 7,773.57
4. Step 4: Simplify right side
   12,811.16x = 137,393,729.76
5. Step 5: Solve for x
   x = 137,393,729.76/12,811.16
6. Step 6: Final answer
   x = 10,724.53