Finding the Fourth Proportional to 2,784.78, 4,173.53 and 1,139.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,784.78 : 4,173.53 = 1,139.06 : x
2. Step 2: Convert to fraction form
   2,784.78/4,173.53 = 1,139.06/x
3. Step 3: Cross multiply
   2,784.78x = 4,173.53 × 1,139.06
4. Step 4: Simplify right side
   2,784.78x = 4,753,905.82
5. Step 5: Solve for x
   x = 4,753,905.82/2,784.78
6. Step 6: Final answer
   x = 1,707.10