Finding the Fourth Proportional to 12,986.16, 19,463.70 and 7,443.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,986.16 : 19,463.70 = 7,443.30 : x
2. Step 2: Convert to fraction form
   12,986.16/19,463.70 = 7,443.30/x
3. Step 3: Cross multiply
   12,986.16x = 19,463.70 × 7,443.30
4. Step 4: Simplify right side
   12,986.16x = 144,874,158.21
5. Step 5: Solve for x
   x = 144,874,158.21/12,986.16
6. Step 6: Final answer
   x = 11,156.04