Finding the Fourth Proportional to 8,870.34, 13,227.26 and 8,434.32

Step by Step Solution

1. Step 1: Write the proportion equation
   8,870.34 : 13,227.26 = 8,434.32 : x
2. Step 2: Convert to fraction form
   8,870.34/13,227.26 = 8,434.32/x
3. Step 3: Cross multiply
   8,870.34x = 13,227.26 × 8,434.32
4. Step 4: Simplify right side
   8,870.34x = 111,562,943.56
5. Step 5: Solve for x
   x = 111,562,943.56/8,870.34
6. Step 6: Final answer
   x = 12,577.08