Finding the Fourth Proportional to 3,100.56, 4,279.80 and 2,109.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,100.56 : 4,279.80 = 2,109.12 : x
2. Step 2: Convert to fraction form
   3,100.56/4,279.80 = 2,109.12/x
3. Step 3: Cross multiply
   3,100.56x = 4,279.80 × 2,109.12
4. Step 4: Simplify right side
   3,100.56x = 9,026,611.78
5. Step 5: Solve for x
   x = 9,026,611.78/3,100.56
6. Step 6: Final answer
   x = 2,911.28