Finding the Fourth Proportional to 2,109.57, 2,911.22 and 1,178.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.57 : 2,911.22 = 1,178.07 : x
2. Step 2: Convert to fraction form
   2,109.57/2,911.22 = 1,178.07/x
3. Step 3: Cross multiply
   2,109.57x = 2,911.22 × 1,178.07
4. Step 4: Simplify right side
   2,109.57x = 3,429,615.06
5. Step 5: Solve for x
   x = 3,429,615.06/2,109.57
6. Step 6: Final answer
   x = 1,625.74