Finding the Fourth Proportional to 2,539.52, 3,806.71 and 1,221.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,539.52 : 3,806.71 = 1,221.34 : x
2. Step 2: Convert to fraction form
   2,539.52/3,806.71 = 1,221.34/x
3. Step 3: Cross multiply
   2,539.52x = 3,806.71 × 1,221.34
4. Step 4: Simplify right side
   2,539.52x = 4,649,287.19
5. Step 5: Solve for x
   x = 4,649,287.19/2,539.52
6. Step 6: Final answer
   x = 1,830.77