Finding the Fourth Proportional to 1,054.42, 1,454.88 and 612.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,054.42 : 1,454.88 = 612.30 : x
2. Step 2: Convert to fraction form
   1,054.42/1,454.88 = 612.30/x
3. Step 3: Cross multiply
   1,054.42x = 1,454.88 × 612.30
4. Step 4: Simplify right side
   1,054.42x = 890,823.02
5. Step 5: Solve for x
   x = 890,823.02/1,054.42
6. Step 6: Final answer
   x = 844.85