Finding the Fourth Proportional to 10,428.68, 15,651.78 and 9,771.86

Step by Step Solution

1. Step 1: Write the proportion equation
   10,428.68 : 15,651.78 = 9,771.86 : x
2. Step 2: Convert to fraction form
   10,428.68/15,651.78 = 9,771.86/x
3. Step 3: Cross multiply
   10,428.68x = 15,651.78 × 9,771.86
4. Step 4: Simplify right side
   10,428.68x = 152,947,002.91
5. Step 5: Solve for x
   x = 152,947,002.91/10,428.68
6. Step 6: Final answer
   x = 14,666.00