Finding the Fourth Proportional to 12,672.84, 17,490.26 and 7,963.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,672.84 : 17,490.26 = 7,963.50 : x
2. Step 2: Convert to fraction form
   12,672.84/17,490.26 = 7,963.50/x
3. Step 3: Cross multiply
   12,672.84x = 17,490.26 × 7,963.50
4. Step 4: Simplify right side
   12,672.84x = 139,283,685.51
5. Step 5: Solve for x
   x = 139,283,685.51/12,672.84
6. Step 6: Final answer
   x = 10,990.72