Finding the Fourth Proportional to 1,390.00, 2,082.68 and 978.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,390.00 : 2,082.68 = 978.27 : x
2. Step 2: Convert to fraction form
   1,390.00/2,082.68 = 978.27/x
3. Step 3: Cross multiply
   1,390.00x = 2,082.68 × 978.27
4. Step 4: Simplify right side
   1,390.00x = 2,037,423.36
5. Step 5: Solve for x
   x = 2,037,423.36/1,390.00
6. Step 6: Final answer
   x = 1,465.78