Finding the Fourth Proportional to 2,147.60, 3,215.10 and 1,602.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,147.60 : 3,215.10 = 1,602.20 : x
2. Step 2: Convert to fraction form
   2,147.60/3,215.10 = 1,602.20/x
3. Step 3: Cross multiply
   2,147.60x = 3,215.10 × 1,602.20
4. Step 4: Simplify right side
   2,147.60x = 5,151,233.22
5. Step 5: Solve for x
   x = 5,151,233.22/2,147.60
6. Step 6: Final answer
   x = 2,398.60