Finding the Fourth Proportional to 1,081.47, 1,611.92 and 1,019.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.47 : 1,611.92 = 1,019.96 : x
2. Step 2: Convert to fraction form
   1,081.47/1,611.92 = 1,019.96/x
3. Step 3: Cross multiply
   1,081.47x = 1,611.92 × 1,019.96
4. Step 4: Simplify right side
   1,081.47x = 1,644,080.76
5. Step 5: Solve for x
   x = 1,644,080.76/1,081.47
6. Step 6: Final answer
   x = 1,520.23