Finding the Fourth Proportional to 1,861.02, 2,568.15 and 1,021.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,861.02 : 2,568.15 = 1,021.72 : x
2. Step 2: Convert to fraction form
   1,861.02/2,568.15 = 1,021.72/x
3. Step 3: Cross multiply
   1,861.02x = 2,568.15 × 1,021.72
4. Step 4: Simplify right side
   1,861.02x = 2,623,917.38
5. Step 5: Solve for x
   x = 2,623,917.38/1,861.02
6. Step 6: Final answer
   x = 1,409.94