Finding the Fourth Proportional to 2,109.18, 3,166.20 and 1,292.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.18 : 3,166.20 = 1,292.70 : x
2. Step 2: Convert to fraction form
   2,109.18/3,166.20 = 1,292.70/x
3. Step 3: Cross multiply
   2,109.18x = 3,166.20 × 1,292.70
4. Step 4: Simplify right side
   2,109.18x = 4,092,946.74
5. Step 5: Solve for x
   x = 4,092,946.74/2,109.18
6. Step 6: Final answer
   x = 1,940.54