Finding the Fourth Proportional to 2,109.62, 2,911.32 and 1,225.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.62 : 2,911.32 = 1,225.50 : x
2. Step 2: Convert to fraction form
   2,109.62/2,911.32 = 1,225.50/x
3. Step 3: Cross multiply
   2,109.62x = 2,911.32 × 1,225.50
4. Step 4: Simplify right side
   2,109.62x = 3,567,822.66
5. Step 5: Solve for x
   x = 3,567,822.66/2,109.62
6. Step 6: Final answer
   x = 1,691.22