Finding the Fourth Proportional to 12,776.88, 19,128.24 and 7,831.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,776.88 : 19,128.24 = 7,831.56 : x
2. Step 2: Convert to fraction form
   12,776.88/19,128.24 = 7,831.56/x
3. Step 3: Cross multiply
   12,776.88x = 19,128.24 × 7,831.56
4. Step 4: Simplify right side
   12,776.88x = 149,803,959.25
5. Step 5: Solve for x
   x = 149,803,959.25/12,776.88
6. Step 6: Final answer
   x = 11,724.61