Finding the Fourth Proportional to 2,987.78, 4,123.32 and 1,808.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,987.78 : 4,123.32 = 1,808.96 : x
2. Step 2: Convert to fraction form
   2,987.78/4,123.32 = 1,808.96/x
3. Step 3: Cross multiply
   2,987.78x = 4,123.32 × 1,808.96
4. Step 4: Simplify right side
   2,987.78x = 7,458,920.95
5. Step 5: Solve for x
   x = 7,458,920.95/2,987.78
6. Step 6: Final answer
   x = 2,496.48