Finding the Fourth Proportional to 2,402.20, 3,602.69 and 1,085.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,402.20 : 3,602.69 = 1,085.45 : x
2. Step 2: Convert to fraction form
   2,402.20/3,602.69 = 1,085.45/x
3. Step 3: Cross multiply
   2,402.20x = 3,602.69 × 1,085.45
4. Step 4: Simplify right side
   2,402.20x = 3,910,516.42
5. Step 5: Solve for x
   x = 3,910,516.42/2,402.20
6. Step 6: Final answer
   x = 1,627.89