Finding the Fourth Proportional to 12,787.53, 17,645.54 and 7,481.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,787.53 : 17,645.54 = 7,481.31 : x
2. Step 2: Convert to fraction form
   12,787.53/17,645.54 = 7,481.31/x
3. Step 3: Cross multiply
   12,787.53x = 17,645.54 × 7,481.31
4. Step 4: Simplify right side
   12,787.53x = 132,011,717.45
5. Step 5: Solve for x
   x = 132,011,717.45/12,787.53
6. Step 6: Final answer
   x = 10,323.47