Finding the Fourth Proportional to 2,345.40, 3,519.45 and 885.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,345.40 : 3,519.45 = 885.57 : x
2. Step 2: Convert to fraction form
   2,345.40/3,519.45 = 885.57/x
3. Step 3: Cross multiply
   2,345.40x = 3,519.45 × 885.57
4. Step 4: Simplify right side
   2,345.40x = 3,116,719.34
5. Step 5: Solve for x
   x = 3,116,719.34/2,345.40
6. Step 6: Final answer
   x = 1,328.86