Finding the Fourth Proportional to 2,573.40, 3,859.56 and 1,186.77

Step by Step Solution

1. Step 1: Write the proportion equation
   2,573.40 : 3,859.56 = 1,186.77 : x
2. Step 2: Convert to fraction form
   2,573.40/3,859.56 = 1,186.77/x
3. Step 3: Cross multiply
   2,573.40x = 3,859.56 × 1,186.77
4. Step 4: Simplify right side
   2,573.40x = 4,580,410.02
5. Step 5: Solve for x
   x = 4,580,410.02/2,573.40
6. Step 6: Final answer
   x = 1,779.91