Finding the Fourth Proportional to 2,145.40, 3,219.02 and 846.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.40 : 3,219.02 = 846.60 : x
2. Step 2: Convert to fraction form
   2,145.40/3,219.02 = 846.60/x
3. Step 3: Cross multiply
   2,145.40x = 3,219.02 × 846.60
4. Step 4: Simplify right side
   2,145.40x = 2,725,222.33
5. Step 5: Solve for x
   x = 2,725,222.33/2,145.40
6. Step 6: Final answer
   x = 1,270.26