Finding the Fourth Proportional to 9,389.10, 12,955.71 and 5,196.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,389.10 : 12,955.71 = 5,196.78 : x
2. Step 2: Convert to fraction form
   9,389.10/12,955.71 = 5,196.78/x
3. Step 3: Cross multiply
   9,389.10x = 12,955.71 × 5,196.78
4. Step 4: Simplify right side
   9,389.10x = 67,327,974.61
5. Step 5: Solve for x
   x = 67,327,974.61/9,389.10
6. Step 6: Final answer
   x = 7,170.87