Finding the Fourth Proportional to 2,056.61, 2,838.18 and 1,172.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,056.61 : 2,838.18 = 1,172.39 : x
2. Step 2: Convert to fraction form
   2,056.61/2,838.18 = 1,172.39/x
3. Step 3: Cross multiply
   2,056.61x = 2,838.18 × 1,172.39
4. Step 4: Simplify right side
   2,056.61x = 3,327,453.85
5. Step 5: Solve for x
   x = 3,327,453.85/2,056.61
6. Step 6: Final answer
   x = 1,617.94