Finding the Fourth Proportional to 2,662.37, 3,991.70 and 1,180.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,662.37 : 3,991.70 = 1,180.78 : x
2. Step 2: Convert to fraction form
   2,662.37/3,991.70 = 1,180.78/x
3. Step 3: Cross multiply
   2,662.37x = 3,991.70 × 1,180.78
4. Step 4: Simplify right side
   2,662.37x = 4,713,312.50
5. Step 5: Solve for x
   x = 4,713,312.50/2,662.37
6. Step 6: Final answer
   x = 1,770.35