Finding the Fourth Proportional to 1,101.55, 1,518.59 and 1,072.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,101.55 : 1,518.59 = 1,072.39 : x
2. Step 2: Convert to fraction form
   1,101.55/1,518.59 = 1,072.39/x
3. Step 3: Cross multiply
   1,101.55x = 1,518.59 × 1,072.39
4. Step 4: Simplify right side
   1,101.55x = 1,628,515.37
5. Step 5: Solve for x
   x = 1,628,515.37/1,101.55
6. Step 6: Final answer
   x = 1,478.39