Finding the Fourth Proportional to 2,178.53, 3,007.61 and 1,434.65

Step by Step Solution

1. Step 1: Write the proportion equation
   2,178.53 : 3,007.61 = 1,434.65 : x
2. Step 2: Convert to fraction form
   2,178.53/3,007.61 = 1,434.65/x
3. Step 3: Cross multiply
   2,178.53x = 3,007.61 × 1,434.65
4. Step 4: Simplify right side
   2,178.53x = 4,314,852.65
5. Step 5: Solve for x
   x = 4,314,852.65/2,178.53
6. Step 6: Final answer
   x = 1,980.63