Finding the Fourth Proportional to 12,951.30, 19,412.55 and 7,112.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,951.30 : 19,412.55 = 7,112.10 : x
2. Step 2: Convert to fraction form
   12,951.30/19,412.55 = 7,112.10/x
3. Step 3: Cross multiply
   12,951.30x = 19,412.55 × 7,112.10
4. Step 4: Simplify right side
   12,951.30x = 138,063,996.86
5. Step 5: Solve for x
   x = 138,063,996.86/12,951.30
6. Step 6: Final answer
   x = 10,660.24