Finding the Fourth Proportional to 2,128.76, 3,178.77 and 1,739.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.76 : 3,178.77 = 1,739.52 : x
2. Step 2: Convert to fraction form
   2,128.76/3,178.77 = 1,739.52/x
3. Step 3: Cross multiply
   2,128.76x = 3,178.77 × 1,739.52
4. Step 4: Simplify right side
   2,128.76x = 5,529,533.99
5. Step 5: Solve for x
   x = 5,529,533.99/2,128.76
6. Step 6: Final answer
   x = 2,597.54