Finding the Fourth Proportional to 1,870.39, 2,806.19 and 896.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,870.39 : 2,806.19 = 896.57 : x
2. Step 2: Convert to fraction form
   1,870.39/2,806.19 = 896.57/x
3. Step 3: Cross multiply
   1,870.39x = 2,806.19 × 896.57
4. Step 4: Simplify right side
   1,870.39x = 2,515,927.25
5. Step 5: Solve for x
   x = 2,515,927.25/1,870.39
6. Step 6: Final answer
   x = 1,345.14