Finding the Fourth Proportional to 1,379.59, 2,067.63 and 647.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.59 : 2,067.63 = 647.56 : x
2. Step 2: Convert to fraction form
   1,379.59/2,067.63 = 647.56/x
3. Step 3: Cross multiply
   1,379.59x = 2,067.63 × 647.56
4. Step 4: Simplify right side
   1,379.59x = 1,338,914.48
5. Step 5: Solve for x
   x = 1,338,914.48/1,379.59
6. Step 6: Final answer
   x = 970.52