Finding the Fourth Proportional to 1,870.39, 2,580.91 and 1,031.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,870.39 : 2,580.91 = 1,031.03 : x
2. Step 2: Convert to fraction form
   1,870.39/2,580.91 = 1,031.03/x
3. Step 3: Cross multiply
   1,870.39x = 2,580.91 × 1,031.03
4. Step 4: Simplify right side
   1,870.39x = 2,660,995.63
5. Step 5: Solve for x
   x = 2,660,995.63/1,870.39
6. Step 6: Final answer
   x = 1,422.69