Finding the Fourth Proportional to 1,910.25, 2,636.15 and 1,212.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,910.25 : 2,636.15 = 1,212.57 : x
2. Step 2: Convert to fraction form
   1,910.25/2,636.15 = 1,212.57/x
3. Step 3: Cross multiply
   1,910.25x = 2,636.15 × 1,212.57
4. Step 4: Simplify right side
   1,910.25x = 3,196,510.34
5. Step 5: Solve for x
   x = 3,196,510.34/1,910.25
6. Step 6: Final answer
   x = 1,673.35