Finding the Fourth Proportional to 2,159.93, 2,981.06 and 1,216.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,159.93 : 2,981.06 = 1,216.15 : x
2. Step 2: Convert to fraction form
   2,159.93/2,981.06 = 1,216.15/x
3. Step 3: Cross multiply
   2,159.93x = 2,981.06 × 1,216.15
4. Step 4: Simplify right side
   2,159.93x = 3,625,416.12
5. Step 5: Solve for x
   x = 3,625,416.12/2,159.93
6. Step 6: Final answer
   x = 1,678.49