Finding the Fourth Proportional to 20,294.99, 30,428.71 and 7,145.63

Step by Step Solution

1. Step 1: Write the proportion equation
   20,294.99 : 30,428.71 = 7,145.63 : x
2. Step 2: Convert to fraction form
   20,294.99/30,428.71 = 7,145.63/x
3. Step 3: Cross multiply
   20,294.99x = 30,428.71 × 7,145.63
4. Step 4: Simplify right side
   20,294.99x = 217,432,133.03
5. Step 5: Solve for x
   x = 217,432,133.03/20,294.99
6. Step 6: Final answer
   x = 10,713.59