Finding the Fourth Proportional to 12,953.78, 19,425.78 and 4,186.34

Step by Step Solution

1. Step 1: Write the proportion equation
   12,953.78 : 19,425.78 = 4,186.34 : x
2. Step 2: Convert to fraction form
   12,953.78/19,425.78 = 4,186.34/x
3. Step 3: Cross multiply
   12,953.78x = 19,425.78 × 4,186.34
4. Step 4: Simplify right side
   12,953.78x = 81,322,822.72
5. Step 5: Solve for x
   x = 81,322,822.72/12,953.78
6. Step 6: Final answer
   x = 6,277.92