Finding the Fourth Proportional to 2,784.60, 4,173.78 and 1,139.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,784.60 : 4,173.78 = 1,139.16 : x
2. Step 2: Convert to fraction form
   2,784.60/4,173.78 = 1,139.16/x
3. Step 3: Cross multiply
   2,784.60x = 4,173.78 × 1,139.16
4. Step 4: Simplify right side
   2,784.60x = 4,754,603.22
5. Step 5: Solve for x
   x = 4,754,603.22/2,784.60
6. Step 6: Final answer
   x = 1,707.46