Finding the Fourth Proportional to 8,357.34, 12,475.23 and 7,978.26

Step by Step Solution

1. Step 1: Write the proportion equation
   8,357.34 : 12,475.23 = 7,978.26 : x
2. Step 2: Convert to fraction form
   8,357.34/12,475.23 = 7,978.26/x
3. Step 3: Cross multiply
   8,357.34x = 12,475.23 × 7,978.26
4. Step 4: Simplify right side
   8,357.34x = 99,530,628.50
5. Step 5: Solve for x
   x = 99,530,628.50/8,357.34
6. Step 6: Final answer
   x = 11,909.37