Finding the Fourth Proportional to 2,118.88, 2,924.05 and 1,290.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,118.88 : 2,924.05 = 1,290.88 : x
2. Step 2: Convert to fraction form
   2,118.88/2,924.05 = 1,290.88/x
3. Step 3: Cross multiply
   2,118.88x = 2,924.05 × 1,290.88
4. Step 4: Simplify right side
   2,118.88x = 3,774,579.82
5. Step 5: Solve for x
   x = 3,774,579.82/2,118.88
6. Step 6: Final answer
   x = 1,781.41