Finding the Fourth Proportional to 12,782.45, 17,638.52 and 9,427.07

Step by Step Solution

1. Step 1: Write the proportion equation
   12,782.45 : 17,638.52 = 9,427.07 : x
2. Step 2: Convert to fraction form
   12,782.45/17,638.52 = 9,427.07/x
3. Step 3: Cross multiply
   12,782.45x = 17,638.52 × 9,427.07
4. Step 4: Simplify right side
   12,782.45x = 166,279,427.41
5. Step 5: Solve for x
   x = 166,279,427.41/12,782.45
6. Step 6: Final answer
   x = 13,008.42