Finding the Fourth Proportional to 12,943.30, 17,860.98 and 7,639.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,943.30 : 17,860.98 = 7,639.78 : x
2. Step 2: Convert to fraction form
   12,943.30/17,860.98 = 7,639.78/x
3. Step 3: Cross multiply
   12,943.30x = 17,860.98 × 7,639.78
4. Step 4: Simplify right side
   12,943.30x = 136,453,957.78
5. Step 5: Solve for x
   x = 136,453,957.78/12,943.30
6. Step 6: Final answer
   x = 10,542.44