Finding the Fourth Proportional to 2,389.88, 3,577.86 and 1,776.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,389.88 : 3,577.86 = 1,776.30 : x
2. Step 2: Convert to fraction form
   2,389.88/3,577.86 = 1,776.30/x
3. Step 3: Cross multiply
   2,389.88x = 3,577.86 × 1,776.30
4. Step 4: Simplify right side
   2,389.88x = 6,355,352.72
5. Step 5: Solve for x
   x = 6,355,352.72/2,389.88
6. Step 6: Final answer
   x = 2,659.28