Finding the Fourth Proportional to 2,109.51, 2,911.13 and 1,225.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.51 : 2,911.13 = 1,225.48 : x
2. Step 2: Convert to fraction form
   2,109.51/2,911.13 = 1,225.48/x
3. Step 3: Cross multiply
   2,109.51x = 2,911.13 × 1,225.48
4. Step 4: Simplify right side
   2,109.51x = 3,567,525.47
5. Step 5: Solve for x
   x = 3,567,525.47/2,109.51
6. Step 6: Final answer
   x = 1,691.17