Finding the Fourth Proportional to 2,109.95, 2,911.56 and 1,225.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.95 : 2,911.56 = 1,225.81 : x
2. Step 2: Convert to fraction form
   2,109.95/2,911.56 = 1,225.81/x
3. Step 3: Cross multiply
   2,109.95x = 2,911.56 × 1,225.81
4. Step 4: Simplify right side
   2,109.95x = 3,569,027.60
5. Step 5: Solve for x
   x = 3,569,027.60/2,109.95
6. Step 6: Final answer
   x = 1,691.52