Finding the Fourth Proportional to 10,985.71, 16,478.52 and 2,665.70

Step by Step Solution

1. Step 1: Write the proportion equation
   10,985.71 : 16,478.52 = 2,665.70 : x
2. Step 2: Convert to fraction form
   10,985.71/16,478.52 = 2,665.70/x
3. Step 3: Cross multiply
   10,985.71x = 16,478.52 × 2,665.70
4. Step 4: Simplify right side
   10,985.71x = 43,926,790.76
5. Step 5: Solve for x
   x = 43,926,790.76/10,985.71
6. Step 6: Final answer
   x = 3,998.54