Finding the Fourth Proportional to 1,871.10, 2,808.54 and 1,317.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,871.10 : 2,808.54 = 1,317.06 : x
2. Step 2: Convert to fraction form
   1,871.10/2,808.54 = 1,317.06/x
3. Step 3: Cross multiply
   1,871.10x = 2,808.54 × 1,317.06
4. Step 4: Simplify right side
   1,871.10x = 3,699,015.69
5. Step 5: Solve for x
   x = 3,699,015.69/1,871.10
6. Step 6: Final answer
   x = 1,976.92