Finding the Fourth Proportional to 2,631.55, 3,938.20 and 1,902.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,631.55 : 3,938.20 = 1,902.55 : x
2. Step 2: Convert to fraction form
   2,631.55/3,938.20 = 1,902.55/x
3. Step 3: Cross multiply
   2,631.55x = 3,938.20 × 1,902.55
4. Step 4: Simplify right side
   2,631.55x = 7,492,622.41
5. Step 5: Solve for x
   x = 7,492,622.41/2,631.55
6. Step 6: Final answer
   x = 2,847.23