Finding the Fourth Proportional to 12,949.78, 17,870.64 and 7,360.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,949.78 : 17,870.64 = 7,360.78 : x
2. Step 2: Convert to fraction form
   12,949.78/17,870.64 = 7,360.78/x
3. Step 3: Cross multiply
   12,949.78x = 17,870.64 × 7,360.78
4. Step 4: Simplify right side
   12,949.78x = 131,541,849.50
5. Step 5: Solve for x
   x = 131,541,849.50/12,949.78
6. Step 6: Final answer
   x = 10,157.84