Finding the Fourth Proportional to 1,227.98, 1,840.56 and 612.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,227.98 : 1,840.56 = 612.12 : x
2. Step 2: Convert to fraction form
   1,227.98/1,840.56 = 612.12/x
3. Step 3: Cross multiply
   1,227.98x = 1,840.56 × 612.12
4. Step 4: Simplify right side
   1,227.98x = 1,126,643.59
5. Step 5: Solve for x
   x = 1,126,643.59/1,227.98
6. Step 6: Final answer
   x = 917.48