Finding the Fourth Proportional to 3,938.31, 5,434.88 and 2,169.91

Step by Step Solution

1. Step 1: Write the proportion equation
   3,938.31 : 5,434.88 = 2,169.91 : x
2. Step 2: Convert to fraction form
   3,938.31/5,434.88 = 2,169.91/x
3. Step 3: Cross multiply
   3,938.31x = 5,434.88 × 2,169.91
4. Step 4: Simplify right side
   3,938.31x = 11,793,200.46
5. Step 5: Solve for x
   x = 11,793,200.46/3,938.31
6. Step 6: Final answer
   x = 2,994.48