Finding the Fourth Proportional to 3,385.57, 5,074.89 and 1,921.63

Step by Step Solution

1. Step 1: Write the proportion equation
   3,385.57 : 5,074.89 = 1,921.63 : x
2. Step 2: Convert to fraction form
   3,385.57/5,074.89 = 1,921.63/x
3. Step 3: Cross multiply
   3,385.57x = 5,074.89 × 1,921.63
4. Step 4: Simplify right side
   3,385.57x = 9,752,060.87
5. Step 5: Solve for x
   x = 9,752,060.87/3,385.57
6. Step 6: Final answer
   x = 2,880.48