Finding the Fourth Proportional to 2,162.90, 2,984.76 and 1,218.77

Step by Step Solution

1. Step 1: Write the proportion equation
   2,162.90 : 2,984.76 = 1,218.77 : x
2. Step 2: Convert to fraction form
   2,162.90/2,984.76 = 1,218.77/x
3. Step 3: Cross multiply
   2,162.90x = 2,984.76 × 1,218.77
4. Step 4: Simplify right side
   2,162.90x = 3,637,742.32
5. Step 5: Solve for x
   x = 3,637,742.32/2,162.90
6. Step 6: Final answer
   x = 1,681.88