Finding the Fourth Proportional to 1,081.38, 1,621.98 and 1,054.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.38 : 1,621.98 = 1,054.02 : x
2. Step 2: Convert to fraction form
   1,081.38/1,621.98 = 1,054.02/x
3. Step 3: Cross multiply
   1,081.38x = 1,621.98 × 1,054.02
4. Step 4: Simplify right side
   1,081.38x = 1,709,599.36
5. Step 5: Solve for x
   x = 1,709,599.36/1,081.38
6. Step 6: Final answer
   x = 1,580.94