Finding the Fourth Proportional to 1,146.01, 1,580.33 and 1,019.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,146.01 : 1,580.33 = 1,019.57 : x
2. Step 2: Convert to fraction form
   1,146.01/1,580.33 = 1,019.57/x
3. Step 3: Cross multiply
   1,146.01x = 1,580.33 × 1,019.57
4. Step 4: Simplify right side
   1,146.01x = 1,611,257.06
5. Step 5: Solve for x
   x = 1,611,257.06/1,146.01
6. Step 6: Final answer
   x = 1,405.97