Finding the Fourth Proportional to 8,975.61, 12,390.72 and 5,620.29

Step by Step Solution

1. Step 1: Write the proportion equation
   8,975.61 : 12,390.72 = 5,620.29 : x
2. Step 2: Convert to fraction form
   8,975.61/12,390.72 = 5,620.29/x
3. Step 3: Cross multiply
   8,975.61x = 12,390.72 × 5,620.29
4. Step 4: Simplify right side
   8,975.61x = 69,639,439.71
5. Step 5: Solve for x
   x = 69,639,439.71/8,975.61
6. Step 6: Final answer
   x = 7,758.74