Finding the Fourth Proportional to 2,145.06, 2,960.28 and 1,678.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.06 : 2,960.28 = 1,678.50 : x
2. Step 2: Convert to fraction form
   2,145.06/2,960.28 = 1,678.50/x
3. Step 3: Cross multiply
   2,145.06x = 2,960.28 × 1,678.50
4. Step 4: Simplify right side
   2,145.06x = 4,968,829.98
5. Step 5: Solve for x
   x = 4,968,829.98/2,145.06
6. Step 6: Final answer
   x = 2,316.41