Finding the Fourth Proportional to 12,945.51, 17,859.76 and 7,278.95

Step by Step Solution

1. Step 1: Write the proportion equation
   12,945.51 : 17,859.76 = 7,278.95 : x
2. Step 2: Convert to fraction form
   12,945.51/17,859.76 = 7,278.95/x
3. Step 3: Cross multiply
   12,945.51x = 17,859.76 × 7,278.95
4. Step 4: Simplify right side
   12,945.51x = 130,000,326.50
5. Step 5: Solve for x
   x = 130,000,326.50/12,945.51
6. Step 6: Final answer
   x = 10,042.12