Finding the Fourth Proportional to 11,685.96, 17,487 and 10,903.90

Step by Step Solution

1. Step 1: Write the proportion equation
   11,685.96 : 17,487 = 10,903.90 : x
2. Step 2: Convert to fraction form
   11,685.96/17,487 = 10,903.90/x
3. Step 3: Cross multiply
   11,685.96x = 17,487 × 10,903.90
4. Step 4: Simplify right side
   11,685.96x = 190,676,499.30
5. Step 5: Solve for x
   x = 190,676,499.30/11,685.96
6. Step 6: Final answer
   x = 16,316.72