Finding the Fourth Proportional to 2,173.61, 2,999.56 and 1,178.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,173.61 : 2,999.56 = 1,178.87 : x
2. Step 2: Convert to fraction form
   2,173.61/2,999.56 = 1,178.87/x
3. Step 3: Cross multiply
   2,173.61x = 2,999.56 × 1,178.87
4. Step 4: Simplify right side
   2,173.61x = 3,536,091.30
5. Step 5: Solve for x
   x = 3,536,091.30/2,173.61
6. Step 6: Final answer
   x = 1,626.83