Finding the Fourth Proportional to 1,055.06, 1,456.32 and 612.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,055.06 : 1,456.32 = 612.87 : x
2. Step 2: Convert to fraction form
   1,055.06/1,456.32 = 612.87/x
3. Step 3: Cross multiply
   1,055.06x = 1,456.32 × 612.87
4. Step 4: Simplify right side
   1,055.06x = 892,538.52
5. Step 5: Solve for x
   x = 892,538.52/1,055.06
6. Step 6: Final answer
   x = 845.96