Finding the Fourth Proportional to 2,109.12, 2,908.96 and 1,401.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.12 : 2,908.96 = 1,401.28 : x
2. Step 2: Convert to fraction form
   2,109.12/2,908.96 = 1,401.28/x
3. Step 3: Cross multiply
   2,109.12x = 2,908.96 × 1,401.28
4. Step 4: Simplify right side
   2,109.12x = 4,076,267.47
5. Step 5: Solve for x
   x = 4,076,267.47/2,109.12
6. Step 6: Final answer
   x = 1,932.69