Finding the Fourth Proportional to 8,870.67, 13,279.43 and 8,555.24

Step by Step Solution

1. Step 1: Write the proportion equation
   8,870.67 : 13,279.43 = 8,555.24 : x
2. Step 2: Convert to fraction form
   8,870.67/13,279.43 = 8,555.24/x
3. Step 3: Cross multiply
   8,870.67x = 13,279.43 × 8,555.24
4. Step 4: Simplify right side
   8,870.67x = 113,608,710.71
5. Step 5: Solve for x
   x = 113,608,710.71/8,870.67
6. Step 6: Final answer
   x = 12,807.23