Finding the Fourth Proportional to 2,109.52, 2,911.31 and 1,225

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.52 : 2,911.31 = 1,225 : x
2. Step 2: Convert to fraction form
   2,109.52/2,911.31 = 1,225/x
3. Step 3: Cross multiply
   2,109.52x = 2,911.31 × 1,225
4. Step 4: Simplify right side
   2,109.52x = 3,566,354.75
5. Step 5: Solve for x
   x = 3,566,354.75/2,109.52
6. Step 6: Final answer
   x = 1,690.60