Finding the Fourth Proportional to 2,107.60, 2,908.50 and 1,223.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,107.60 : 2,908.50 = 1,223.42 : x
2. Step 2: Convert to fraction form
   2,107.60/2,908.50 = 1,223.42/x
3. Step 3: Cross multiply
   2,107.60x = 2,908.50 × 1,223.42
4. Step 4: Simplify right side
   2,107.60x = 3,558,317.07
5. Step 5: Solve for x
   x = 3,558,317.07/2,107.60
6. Step 6: Final answer
   x = 1,688.33