Finding the Fourth Proportional to 12,929.83, 19,356.47 and 7,983.57

Step by Step Solution

1. Step 1: Write the proportion equation
   12,929.83 : 19,356.47 = 7,983.57 : x
2. Step 2: Convert to fraction form
   12,929.83/19,356.47 = 7,983.57/x
3. Step 3: Cross multiply
   12,929.83x = 19,356.47 × 7,983.57
4. Step 4: Simplify right side
   12,929.83x = 154,533,733.20
5. Step 5: Solve for x
   x = 154,533,733.20/12,929.83
6. Step 6: Final answer
   x = 11,951.72