Finding the Fourth Proportional to 10,674.78, 14,736.90 and 7,143.99

Step by Step Solution

1. Step 1: Write the proportion equation
   10,674.78 : 14,736.90 = 7,143.99 : x
2. Step 2: Convert to fraction form
   10,674.78/14,736.90 = 7,143.99/x
3. Step 3: Cross multiply
   10,674.78x = 14,736.90 × 7,143.99
4. Step 4: Simplify right side
   10,674.78x = 105,280,266.23
5. Step 5: Solve for x
   x = 105,280,266.23/10,674.78
6. Step 6: Final answer
   x = 9,862.52