Finding the Fourth Proportional to 12,357.36, 17,046.80 and 8,377.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,357.36 : 17,046.80 = 8,377.12 : x
2. Step 2: Convert to fraction form
   12,357.36/17,046.80 = 8,377.12/x
3. Step 3: Cross multiply
   12,357.36x = 17,046.80 × 8,377.12
4. Step 4: Simplify right side
   12,357.36x = 142,803,089.22
5. Step 5: Solve for x
   x = 142,803,089.22/12,357.36
6. Step 6: Final answer
   x = 11,556.12