Finding the Fourth Proportional to 1,379.31, 2,068.50 and 454.65

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.31 : 2,068.50 = 454.65 : x
2. Step 2: Convert to fraction form
   1,379.31/2,068.50 = 454.65/x
3. Step 3: Cross multiply
   1,379.31x = 2,068.50 × 454.65
4. Step 4: Simplify right side
   1,379.31x = 940,443.53
5. Step 5: Solve for x
   x = 940,443.53/1,379.31
6. Step 6: Final answer
   x = 681.82