Finding the Fourth Proportional to 1,420.89, 2,128.55 and 802.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,420.89 : 2,128.55 = 802.73 : x
2. Step 2: Convert to fraction form
   1,420.89/2,128.55 = 802.73/x
3. Step 3: Cross multiply
   1,420.89x = 2,128.55 × 802.73
4. Step 4: Simplify right side
   1,420.89x = 1,708,636.29
5. Step 5: Solve for x
   x = 1,708,636.29/1,420.89
6. Step 6: Final answer
   x = 1,202.51