Finding the Fourth Proportional to 12,789.37, 19,186.80 and 7,245.37

Step by Step Solution

1. Step 1: Write the proportion equation
   12,789.37 : 19,186.80 = 7,245.37 : x
2. Step 2: Convert to fraction form
   12,789.37/19,186.80 = 7,245.37/x
3. Step 3: Cross multiply
   12,789.37x = 19,186.80 × 7,245.37
4. Step 4: Simplify right side
   12,789.37x = 139,015,465.12
5. Step 5: Solve for x
   x = 139,015,465.12/12,789.37
6. Step 6: Final answer
   x = 10,869.61