Finding the Fourth Proportional to 1,334.25, 1,993.28 and 1,115.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,334.25 : 1,993.28 = 1,115.55 : x
2. Step 2: Convert to fraction form
   1,334.25/1,993.28 = 1,115.55/x
3. Step 3: Cross multiply
   1,334.25x = 1,993.28 × 1,115.55
4. Step 4: Simplify right side
   1,334.25x = 2,223,597.93
5. Step 5: Solve for x
   x = 2,223,597.93/1,334.25
6. Step 6: Final answer
   x = 1,666.55