Finding the Fourth Proportional to 8,923.74, 12,315.60 and 5,389.86

Step by Step Solution

1. Step 1: Write the proportion equation
   8,923.74 : 12,315.60 = 5,389.86 : x
2. Step 2: Convert to fraction form
   8,923.74/12,315.60 = 5,389.86/x
3. Step 3: Cross multiply
   8,923.74x = 12,315.60 × 5,389.86
4. Step 4: Simplify right side
   8,923.74x = 66,379,359.82
5. Step 5: Solve for x
   x = 66,379,359.82/8,923.74
6. Step 6: Final answer
   x = 7,438.51