Finding the Fourth Proportional to 12,945.76, 17,865.12 and 7,356.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,945.76 : 17,865.12 = 7,356.76 : x
2. Step 2: Convert to fraction form
   12,945.76/17,865.12 = 7,356.76/x
3. Step 3: Cross multiply
   12,945.76x = 17,865.12 × 7,356.76
4. Step 4: Simplify right side
   12,945.76x = 131,429,400.21
5. Step 5: Solve for x
   x = 131,429,400.21/12,945.76
6. Step 6: Final answer
   x = 10,152.31