Finding the Fourth Proportional to 9,386.50, 12,953.61 and 5,660.74

Step by Step Solution

1. Step 1: Write the proportion equation
   9,386.50 : 12,953.61 = 5,660.74 : x
2. Step 2: Convert to fraction form
   9,386.50/12,953.61 = 5,660.74/x
3. Step 3: Cross multiply
   9,386.50x = 12,953.61 × 5,660.74
4. Step 4: Simplify right side
   9,386.50x = 73,327,018.27
5. Step 5: Solve for x
   x = 73,327,018.27/9,386.50
6. Step 6: Final answer
   x = 7,811.97