Finding the Fourth Proportional to 12,953.74, 19,440.06 and 5,164.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,953.74 : 19,440.06 = 5,164.78 : x
2. Step 2: Convert to fraction form
   12,953.74/19,440.06 = 5,164.78/x
3. Step 3: Cross multiply
   12,953.74x = 19,440.06 × 5,164.78
4. Step 4: Simplify right side
   12,953.74x = 100,403,633.09
5. Step 5: Solve for x
   x = 100,403,633.09/12,953.74
6. Step 6: Final answer
   x = 7,750.94