Finding the Fourth Proportional to 1,379.16, 2,068.86 and 454.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.16 : 2,068.86 = 454.72 : x
2. Step 2: Convert to fraction form
   1,379.16/2,068.86 = 454.72/x
3. Step 3: Cross multiply
   1,379.16x = 2,068.86 × 454.72
4. Step 4: Simplify right side
   1,379.16x = 940,752.02
5. Step 5: Solve for x
   x = 940,752.02/1,379.16
6. Step 6: Final answer
   x = 682.12