Finding the Fourth Proportional to 1,869.09, 2,580.72 and 1,206.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,869.09 : 2,580.72 = 1,206.33 : x
2. Step 2: Convert to fraction form
   1,869.09/2,580.72 = 1,206.33/x
3. Step 3: Cross multiply
   1,869.09x = 2,580.72 × 1,206.33
4. Step 4: Simplify right side
   1,869.09x = 3,113,199.96
5. Step 5: Solve for x
   x = 3,113,199.96/1,869.09
6. Step 6: Final answer
   x = 1,665.62