Finding the Fourth Proportional to 1,860, 2,566.70 and 1,020.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,860 : 2,566.70 = 1,020.69 : x
2. Step 2: Convert to fraction form
   1,860/2,566.70 = 1,020.69/x
3. Step 3: Cross multiply
   1,860x = 2,566.70 × 1,020.69
4. Step 4: Simplify right side
   1,860x = 2,619,805.02
5. Step 5: Solve for x
   x = 2,619,805.02/1,860
6. Step 6: Final answer
   x = 1,408.50