Finding the Fourth Proportional to 1,055.08, 1,455.72 and 612.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,055.08 : 1,455.72 = 612.89 : x
2. Step 2: Convert to fraction form
   1,055.08/1,455.72 = 612.89/x
3. Step 3: Cross multiply
   1,055.08x = 1,455.72 × 612.89
4. Step 4: Simplify right side
   1,055.08x = 892,199.65
5. Step 5: Solve for x
   x = 892,199.65/1,055.08
6. Step 6: Final answer
   x = 845.63