Finding the Fourth Proportional to 1,379.51, 2,068.25 and 648.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.51 : 2,068.25 = 648.69 : x
2. Step 2: Convert to fraction form
   1,379.51/2,068.25 = 648.69/x
3. Step 3: Cross multiply
   1,379.51x = 2,068.25 × 648.69
4. Step 4: Simplify right side
   1,379.51x = 1,341,649.54
5. Step 5: Solve for x
   x = 1,341,649.54/1,379.51
6. Step 6: Final answer
   x = 972.56