Finding the Fourth Proportional to 1,436.72, 2,155.80 and 706.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,436.72 : 2,155.80 = 706.96 : x
2. Step 2: Convert to fraction form
   1,436.72/2,155.80 = 706.96/x
3. Step 3: Cross multiply
   1,436.72x = 2,155.80 × 706.96
4. Step 4: Simplify right side
   1,436.72x = 1,524,064.37
5. Step 5: Solve for x
   x = 1,524,064.37/1,436.72
6. Step 6: Final answer
   x = 1,060.79