Finding the Fourth Proportional to 1,053.99, 1,454.78 and 612.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,053.99 : 1,454.78 = 612.15 : x
2. Step 2: Convert to fraction form
   1,053.99/1,454.78 = 612.15/x
3. Step 3: Cross multiply
   1,053.99x = 1,454.78 × 612.15
4. Step 4: Simplify right side
   1,053.99x = 890,540.52
5. Step 5: Solve for x
   x = 890,540.52/1,053.99
6. Step 6: Final answer
   x = 844.92