Finding the Fourth Proportional to 10,665.81, 15,999.12 and 2,874.69

Step by Step Solution

1. Step 1: Write the proportion equation
   10,665.81 : 15,999.12 = 2,874.69 : x
2. Step 2: Convert to fraction form
   10,665.81/15,999.12 = 2,874.69/x
3. Step 3: Cross multiply
   10,665.81x = 15,999.12 × 2,874.69
4. Step 4: Simplify right side
   10,665.81x = 45,992,510.27
5. Step 5: Solve for x
   x = 45,992,510.27/10,665.81
6. Step 6: Final answer
   x = 4,312.14