Finding the Fourth Proportional to 1,678.32, 2,315.72 and 1,259.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,678.32 : 2,315.72 = 1,259.12 : x
2. Step 2: Convert to fraction form
   1,678.32/2,315.72 = 1,259.12/x
3. Step 3: Cross multiply
   1,678.32x = 2,315.72 × 1,259.12
4. Step 4: Simplify right side
   1,678.32x = 2,915,769.37
5. Step 5: Solve for x
   x = 2,915,769.37/1,678.32
6. Step 6: Final answer
   x = 1,737.31