Finding the Fourth Proportional to 1,454.38, 2,178.56 and 711.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,454.38 : 2,178.56 = 711.76 : x
2. Step 2: Convert to fraction form
   1,454.38/2,178.56 = 711.76/x
3. Step 3: Cross multiply
   1,454.38x = 2,178.56 × 711.76
4. Step 4: Simplify right side
   1,454.38x = 1,550,611.87
5. Step 5: Solve for x
   x = 1,550,611.87/1,454.38
6. Step 6: Final answer
   x = 1,066.17