Finding the Fourth Proportional to 1,317.72, 1,966.96 and 1,219.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,317.72 : 1,966.96 = 1,219.98 : x
2. Step 2: Convert to fraction form
   1,317.72/1,966.96 = 1,219.98/x
3. Step 3: Cross multiply
   1,317.72x = 1,966.96 × 1,219.98
4. Step 4: Simplify right side
   1,317.72x = 2,399,651.86
5. Step 5: Solve for x
   x = 2,399,651.86/1,317.72
6. Step 6: Final answer
   x = 1,821.06