Finding the Fourth Proportional to 1,417.72, 2,128.60 and 801.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,417.72 : 2,128.60 = 801.30 : x
2. Step 2: Convert to fraction form
   1,417.72/2,128.60 = 801.30/x
3. Step 3: Cross multiply
   1,417.72x = 2,128.60 × 801.30
4. Step 4: Simplify right side
   1,417.72x = 1,705,647.18
5. Step 5: Solve for x
   x = 1,705,647.18/1,417.72
6. Step 6: Final answer
   x = 1,203.09