Finding the Fourth Proportional to 2,390.28, 3,298.32 and 1,505.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,390.28 : 3,298.32 = 1,505.76 : x
2. Step 2: Convert to fraction form
   2,390.28/3,298.32 = 1,505.76/x
3. Step 3: Cross multiply
   2,390.28x = 3,298.32 × 1,505.76
4. Step 4: Simplify right side
   2,390.28x = 4,966,478.32
5. Step 5: Solve for x
   x = 4,966,478.32/2,390.28
6. Step 6: Final answer
   x = 2,077.78