Finding the Fourth Proportional to 2,145.67, 3,219.90 and 976.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.67 : 3,219.90 = 976.30 : x
2. Step 2: Convert to fraction form
   2,145.67/3,219.90 = 976.30/x
3. Step 3: Cross multiply
   2,145.67x = 3,219.90 × 976.30
4. Step 4: Simplify right side
   2,145.67x = 3,143,588.37
5. Step 5: Solve for x
   x = 3,143,588.37/2,145.67
6. Step 6: Final answer
   x = 1,465.08