Finding the Fourth Proportional to 2,109.60, 2,911.88 and 1,225.84

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.60 : 2,911.88 = 1,225.84 : x
2. Step 2: Convert to fraction form
   2,109.60/2,911.88 = 1,225.84/x
3. Step 3: Cross multiply
   2,109.60x = 2,911.88 × 1,225.84
4. Step 4: Simplify right side
   2,109.60x = 3,569,498.98
5. Step 5: Solve for x
   x = 3,569,498.98/2,109.60
6. Step 6: Final answer
   x = 1,692.03