Finding the Fourth Proportional to 2,117, 2,921.48 and 1,172.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,117 : 2,921.48 = 1,172.82 : x
2. Step 2: Convert to fraction form
   2,117/2,921.48 = 1,172.82/x
3. Step 3: Cross multiply
   2,117x = 2,921.48 × 1,172.82
4. Step 4: Simplify right side
   2,117x = 3,426,370.17
5. Step 5: Solve for x
   x = 3,426,370.17/2,117
6. Step 6: Final answer
   x = 1,618.50