Finding the Fourth Proportional to 2,390.78, 3,298.37 and 1,762.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,390.78 : 3,298.37 = 1,762.80 : x
2. Step 2: Convert to fraction form
   2,390.78/3,298.37 = 1,762.80/x
3. Step 3: Cross multiply
   2,390.78x = 3,298.37 × 1,762.80
4. Step 4: Simplify right side
   2,390.78x = 5,814,357.82
5. Step 5: Solve for x
   x = 5,814,357.82/2,390.78
6. Step 6: Final answer
   x = 2,432.00