Finding the Fourth Proportional to 8,287.10, 12,422.55 and 7,412.30

Step by Step Solution

1. Step 1: Write the proportion equation
   8,287.10 : 12,422.55 = 7,412.30 : x
2. Step 2: Convert to fraction form
   8,287.10/12,422.55 = 7,412.30/x
3. Step 3: Cross multiply
   8,287.10x = 12,422.55 × 7,412.30
4. Step 4: Simplify right side
   8,287.10x = 92,079,667.37
5. Step 5: Solve for x
   x = 92,079,667.37/8,287.10
6. Step 6: Final answer
   x = 11,111.21