Finding the Fourth Proportional to 9,345.50, 12,896.79 and 5,619.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,345.50 : 12,896.79 = 5,619.50 : x
2. Step 2: Convert to fraction form
   9,345.50/12,896.79 = 5,619.50/x
3. Step 3: Cross multiply
   9,345.50x = 12,896.79 × 5,619.50
4. Step 4: Simplify right side
   9,345.50x = 72,473,511.41
5. Step 5: Solve for x
   x = 72,473,511.41/9,345.50
6. Step 6: Final answer
   x = 7,754.91