Finding the Fourth Proportional to 3,786.01, 5,678.55 and 1,320.63

Step by Step Solution

1. Step 1: Write the proportion equation
   3,786.01 : 5,678.55 = 1,320.63 : x
2. Step 2: Convert to fraction form
   3,786.01/5,678.55 = 1,320.63/x
3. Step 3: Cross multiply
   3,786.01x = 5,678.55 × 1,320.63
4. Step 4: Simplify right side
   3,786.01x = 7,499,263.49
5. Step 5: Solve for x
   x = 7,499,263.49/3,786.01
6. Step 6: Final answer
   x = 1,980.78