Finding the Fourth Proportional to 2,599.78, 3,587.73 and 1,420.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,599.78 : 3,587.73 = 1,420.87 : x
2. Step 2: Convert to fraction form
   2,599.78/3,587.73 = 1,420.87/x
3. Step 3: Cross multiply
   2,599.78x = 3,587.73 × 1,420.87
4. Step 4: Simplify right side
   2,599.78x = 5,097,697.93
5. Step 5: Solve for x
   x = 5,097,697.93/2,599.78
6. Step 6: Final answer
   x = 1,960.82