Finding the Fourth Proportional to 12,538.47, 17,316 and 10,851.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,538.47 : 17,316 = 10,851.78 : x
2. Step 2: Convert to fraction form
   12,538.47/17,316 = 10,851.78/x
3. Step 3: Cross multiply
   12,538.47x = 17,316 × 10,851.78
4. Step 4: Simplify right side
   12,538.47x = 187,909,422.48
5. Step 5: Solve for x
   x = 187,909,422.48/12,538.47
6. Step 6: Final answer
   x = 14,986.63