Finding the Fourth Proportional to 3,100.85, 4,279.43 and 1,921.69

Step by Step Solution

1. Step 1: Write the proportion equation
   3,100.85 : 4,279.43 = 1,921.69 : x
2. Step 2: Convert to fraction form
   3,100.85/4,279.43 = 1,921.69/x
3. Step 3: Cross multiply
   3,100.85x = 4,279.43 × 1,921.69
4. Step 4: Simplify right side
   3,100.85x = 8,223,731.94
5. Step 5: Solve for x
   x = 8,223,731.94/3,100.85
6. Step 6: Final answer
   x = 2,652.09