Finding the Fourth Proportional to 2,109.76, 2,910.98 and 1,225.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.76 : 2,910.98 = 1,225.04 : x
2. Step 2: Convert to fraction form
   2,109.76/2,910.98 = 1,225.04/x
3. Step 3: Cross multiply
   2,109.76x = 2,910.98 × 1,225.04
4. Step 4: Simplify right side
   2,109.76x = 3,566,060.81
5. Step 5: Solve for x
   x = 3,566,060.81/2,109.76
6. Step 6: Final answer
   x = 1,690.27