Finding the Fourth Proportional to 1,219.86, 1,683.18 and 722.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,219.86 : 1,683.18 = 722.52 : x
2. Step 2: Convert to fraction form
   1,219.86/1,683.18 = 722.52/x
3. Step 3: Cross multiply
   1,219.86x = 1,683.18 × 722.52
4. Step 4: Simplify right side
   1,219.86x = 1,216,131.21
5. Step 5: Solve for x
   x = 1,216,131.21/1,219.86
6. Step 6: Final answer
   x = 996.94