Finding the Fourth Proportional to 8,925.53, 13,308.51 and 8,680.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,925.53 : 13,308.51 = 8,680.31 : x
2. Step 2: Convert to fraction form
   8,925.53/13,308.51 = 8,680.31/x
3. Step 3: Cross multiply
   8,925.53x = 13,308.51 × 8,680.31
4. Step 4: Simplify right side
   8,925.53x = 115,522,009.25
5. Step 5: Solve for x
   x = 115,522,009.25/8,925.53
6. Step 6: Final answer
   x = 12,942.87