Finding the Fourth Proportional to 2,117.88, 2,922.47 and 1,173.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,117.88 : 2,922.47 = 1,173.72 : x
2. Step 2: Convert to fraction form
   2,117.88/2,922.47 = 1,173.72/x
3. Step 3: Cross multiply
   2,117.88x = 2,922.47 × 1,173.72
4. Step 4: Simplify right side
   2,117.88x = 3,430,164.42
5. Step 5: Solve for x
   x = 3,430,164.42/2,117.88
6. Step 6: Final answer
   x = 1,619.62