Finding the Fourth Proportional to 1,487.37, 2,228.20 and 902.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,487.37 : 2,228.20 = 902.55 : x
2. Step 2: Convert to fraction form
   1,487.37/2,228.20 = 902.55/x
3. Step 3: Cross multiply
   1,487.37x = 2,228.20 × 902.55
4. Step 4: Simplify right side
   1,487.37x = 2,011,061.91
5. Step 5: Solve for x
   x = 2,011,061.91/1,487.37
6. Step 6: Final answer
   x = 1,352.09