Finding the Fourth Proportional to 1,679.34, 2,316.82 and 971.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,679.34 : 2,316.82 = 971.05 : x
2. Step 2: Convert to fraction form
   1,679.34/2,316.82 = 971.05/x
3. Step 3: Cross multiply
   1,679.34x = 2,316.82 × 971.05
4. Step 4: Simplify right side
   1,679.34x = 2,249,756.28
5. Step 5: Solve for x
   x = 2,249,756.28/1,679.34
6. Step 6: Final answer
   x = 1,339.67