Finding the Fourth Proportional to 3,894.78, 5,374.72 and 2,126.34

Step by Step Solution

1. Step 1: Write the proportion equation
   3,894.78 : 5,374.72 = 2,126.34 : x
2. Step 2: Convert to fraction form
   3,894.78/5,374.72 = 2,126.34/x
3. Step 3: Cross multiply
   3,894.78x = 5,374.72 × 2,126.34
4. Step 4: Simplify right side
   3,894.78x = 11,428,482.12
5. Step 5: Solve for x
   x = 11,428,482.12/3,894.78
6. Step 6: Final answer
   x = 2,934.31