Finding the Fourth Proportional to 2,752.21, 4,128.27 and 1,290.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,752.21 : 4,128.27 = 1,290.34 : x
2. Step 2: Convert to fraction form
   2,752.21/4,128.27 = 1,290.34/x
3. Step 3: Cross multiply
   2,752.21x = 4,128.27 × 1,290.34
4. Step 4: Simplify right side
   2,752.21x = 5,326,871.91
5. Step 5: Solve for x
   x = 5,326,871.91/2,752.21
6. Step 6: Final answer
   x = 1,935.49