Finding the Fourth Proportional to 2,111.74, 2,914.37 and 1,215.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.74 : 2,914.37 = 1,215.76 : x
2. Step 2: Convert to fraction form
   2,111.74/2,914.37 = 1,215.76/x
3. Step 3: Cross multiply
   2,111.74x = 2,914.37 × 1,215.76
4. Step 4: Simplify right side
   2,111.74x = 3,543,174.47
5. Step 5: Solve for x
   x = 3,543,174.47/2,111.74
6. Step 6: Final answer
   x = 1,677.85