Finding the Fourth Proportional to 10,019.30, 13,821.57 and 9,306.94

Step by Step Solution

1. Step 1: Write the proportion equation
   10,019.30 : 13,821.57 = 9,306.94 : x
2. Step 2: Convert to fraction form
   10,019.30/13,821.57 = 9,306.94/x
3. Step 3: Cross multiply
   10,019.30x = 13,821.57 × 9,306.94
4. Step 4: Simplify right side
   10,019.30x = 128,636,522.70
5. Step 5: Solve for x
   x = 128,636,522.70/10,019.30
6. Step 6: Final answer
   x = 12,838.87