Finding the Fourth Proportional to 1,871.16, 2,580.33 and 1,208.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,871.16 : 2,580.33 = 1,208.35 : x
2. Step 2: Convert to fraction form
   1,871.16/2,580.33 = 1,208.35/x
3. Step 3: Cross multiply
   1,871.16x = 2,580.33 × 1,208.35
4. Step 4: Simplify right side
   1,871.16x = 3,117,941.76
5. Step 5: Solve for x
   x = 3,117,941.76/1,871.16
6. Step 6: Final answer
   x = 1,666.31