Finding the Fourth Proportional to 1,870.22, 2,806.50 and 830.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,870.22 : 2,806.50 = 830.18 : x
2. Step 2: Convert to fraction form
   1,870.22/2,806.50 = 830.18/x
3. Step 3: Cross multiply
   1,870.22x = 2,806.50 × 830.18
4. Step 4: Simplify right side
   1,870.22x = 2,329,900.17
5. Step 5: Solve for x
   x = 2,329,900.17/1,870.22
6. Step 6: Final answer
   x = 1,245.79