Finding the Fourth Proportional to 8,928.74, 12,321.56 and 5,151.86

Step by Step Solution

1. Step 1: Write the proportion equation
   8,928.74 : 12,321.56 = 5,151.86 : x
2. Step 2: Convert to fraction form
   8,928.74/12,321.56 = 5,151.86/x
3. Step 3: Cross multiply
   8,928.74x = 12,321.56 × 5,151.86
4. Step 4: Simplify right side
   8,928.74x = 63,478,952.10
5. Step 5: Solve for x
   x = 63,478,952.10/8,928.74
6. Step 6: Final answer
   x = 7,109.51