Finding the Fourth Proportional to 2,112.64, 2,917.38 and 1,587.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.64 : 2,917.38 = 1,587.76 : x
2. Step 2: Convert to fraction form
   2,112.64/2,917.38 = 1,587.76/x
3. Step 3: Cross multiply
   2,112.64x = 2,917.38 × 1,587.76
4. Step 4: Simplify right side
   2,112.64x = 4,632,099.27
5. Step 5: Solve for x
   x = 4,632,099.27/2,112.64
6. Step 6: Final answer
   x = 2,192.56