Finding the Fourth Proportional to 1,870.16, 2,581.17 and 1,239.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,870.16 : 2,581.17 = 1,239.57 : x
2. Step 2: Convert to fraction form
   1,870.16/2,581.17 = 1,239.57/x
3. Step 3: Cross multiply
   1,870.16x = 2,581.17 × 1,239.57
4. Step 4: Simplify right side
   1,870.16x = 3,199,536.25
5. Step 5: Solve for x
   x = 3,199,536.25/1,870.16
6. Step 6: Final answer
   x = 1,710.84