Finding the Fourth Proportional to 2,386.58, 3,577.77 and 1,215.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,386.58 : 3,577.77 = 1,215.05 : x
2. Step 2: Convert to fraction form
   2,386.58/3,577.77 = 1,215.05/x
3. Step 3: Cross multiply
   2,386.58x = 3,577.77 × 1,215.05
4. Step 4: Simplify right side
   2,386.58x = 4,347,151.55
5. Step 5: Solve for x
   x = 4,347,151.55/2,386.58
6. Step 6: Final answer
   x = 1,821.50