Finding the Fourth Proportional to 1,056.78, 1,456.06 and 706.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,056.78 : 1,456.06 = 706.86 : x
2. Step 2: Convert to fraction form
   1,056.78/1,456.06 = 706.86/x
3. Step 3: Cross multiply
   1,056.78x = 1,456.06 × 706.86
4. Step 4: Simplify right side
   1,056.78x = 1,029,230.57
5. Step 5: Solve for x
   x = 1,029,230.57/1,056.78
6. Step 6: Final answer
   x = 973.93