Finding the Fourth Proportional to 12,488.31, 18,748.94 and 11,456.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,488.31 : 18,748.94 = 11,456.78 : x
2. Step 2: Convert to fraction form
   12,488.31/18,748.94 = 11,456.78/x
3. Step 3: Cross multiply
   12,488.31x = 18,748.94 × 11,456.78
4. Step 4: Simplify right side
   12,488.31x = 214,802,329.78
5. Step 5: Solve for x
   x = 214,802,329.78/12,488.31
6. Step 6: Final answer
   x = 17,200.27