Finding the Fourth Proportional to 2,657.78, 3,988 and 1,196.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,657.78 : 3,988 = 1,196.62 : x
2. Step 2: Convert to fraction form
   2,657.78/3,988 = 1,196.62/x
3. Step 3: Cross multiply
   2,657.78x = 3,988 × 1,196.62
4. Step 4: Simplify right side
   2,657.78x = 4,772,120.56
5. Step 5: Solve for x
   x = 4,772,120.56/2,657.78
6. Step 6: Final answer
   x = 1,795.53