Finding the Fourth Proportional to 1,364.63, 2,046.89 and 390.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,364.63 : 2,046.89 = 390.72 : x
2. Step 2: Convert to fraction form
   1,364.63/2,046.89 = 390.72/x
3. Step 3: Cross multiply
   1,364.63x = 2,046.89 × 390.72
4. Step 4: Simplify right side
   1,364.63x = 799,758.91
5. Step 5: Solve for x
   x = 799,758.91/1,364.63
6. Step 6: Final answer
   x = 586.06