Finding the Fourth Proportional to 12,946.78, 17,866.50 and 7,357.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,946.78 : 17,866.50 = 7,357.78 : x
2. Step 2: Convert to fraction form
   12,946.78/17,866.50 = 7,357.78/x
3. Step 3: Cross multiply
   12,946.78x = 17,866.50 × 7,357.78
4. Step 4: Simplify right side
   12,946.78x = 131,457,776.37
5. Step 5: Solve for x
   x = 131,457,776.37/12,946.78
6. Step 6: Final answer
   x = 10,153.70