Finding the Fourth Proportional to 4,715.31, 7,074.79 and 1,428.43

Step by Step Solution

1. Step 1: Write the proportion equation
   4,715.31 : 7,074.79 = 1,428.43 : x
2. Step 2: Convert to fraction form
   4,715.31/7,074.79 = 1,428.43/x
3. Step 3: Cross multiply
   4,715.31x = 7,074.79 × 1,428.43
4. Step 4: Simplify right side
   4,715.31x = 10,105,835.14
5. Step 5: Solve for x
   x = 10,105,835.14/4,715.31
6. Step 6: Final answer
   x = 2,143.20