Finding the Fourth Proportional to 2,116.64, 2,921.74 and 1,722.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,116.64 : 2,921.74 = 1,722.98 : x
2. Step 2: Convert to fraction form
   2,116.64/2,921.74 = 1,722.98/x
3. Step 3: Cross multiply
   2,116.64x = 2,921.74 × 1,722.98
4. Step 4: Simplify right side
   2,116.64x = 5,034,099.59
5. Step 5: Solve for x
   x = 5,034,099.59/2,116.64
6. Step 6: Final answer
   x = 2,378.34