Finding the Fourth Proportional to 2,109.63, 2,911.28 and 1,178.13

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.63 : 2,911.28 = 1,178.13 : x
2. Step 2: Convert to fraction form
   2,109.63/2,911.28 = 1,178.13/x
3. Step 3: Cross multiply
   2,109.63x = 2,911.28 × 1,178.13
4. Step 4: Simplify right side
   2,109.63x = 3,429,866.31
5. Step 5: Solve for x
   x = 3,429,866.31/2,109.63
6. Step 6: Final answer
   x = 1,625.81