Finding the Fourth Proportional to 2,112.05, 2,914.61 and 1,167.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.05 : 2,914.61 = 1,167.90 : x
2. Step 2: Convert to fraction form
   2,112.05/2,914.61 = 1,167.90/x
3. Step 3: Cross multiply
   2,112.05x = 2,914.61 × 1,167.90
4. Step 4: Simplify right side
   2,112.05x = 3,403,973.02
5. Step 5: Solve for x
   x = 3,403,973.02/2,112.05
6. Step 6: Final answer
   x = 1,611.69