Finding the Fourth Proportional to 1,078.08, 1,487.70 and 612.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.08 : 1,487.70 = 612.34 : x
2. Step 2: Convert to fraction form
   1,078.08/1,487.70 = 612.34/x
3. Step 3: Cross multiply
   1,078.08x = 1,487.70 × 612.34
4. Step 4: Simplify right side
   1,078.08x = 910,978.22
5. Step 5: Solve for x
   x = 910,978.22/1,078.08
6. Step 6: Final answer
   x = 845.00