Finding the Fourth Proportional to 1,364.42, 1,879.90 and 1,139.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,364.42 : 1,879.90 = 1,139.54 : x
2. Step 2: Convert to fraction form
   1,364.42/1,879.90 = 1,139.54/x
3. Step 3: Cross multiply
   1,364.42x = 1,879.90 × 1,139.54
4. Step 4: Simplify right side
   1,364.42x = 2,142,209.00
5. Step 5: Solve for x
   x = 2,142,209.00/1,364.42
6. Step 6: Final answer
   x = 1,570.05