Finding the Fourth Proportional to 1,379.72, 2,069.89 and 730.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.72 : 2,069.89 = 730.91 : x
2. Step 2: Convert to fraction form
   1,379.72/2,069.89 = 730.91/x
3. Step 3: Cross multiply
   1,379.72x = 2,069.89 × 730.91
4. Step 4: Simplify right side
   1,379.72x = 1,512,903.30
5. Step 5: Solve for x
   x = 1,512,903.30/1,379.72
6. Step 6: Final answer
   x = 1,096.53