Finding the Fourth Proportional to 1,573.59, 2,172.33 and 1,218.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,573.59 : 2,172.33 = 1,218.72 : x
2. Step 2: Convert to fraction form
   1,573.59/2,172.33 = 1,218.72/x
3. Step 3: Cross multiply
   1,573.59x = 2,172.33 × 1,218.72
4. Step 4: Simplify right side
   1,573.59x = 2,647,462.02
5. Step 5: Solve for x
   x = 2,647,462.02/1,573.59
6. Step 6: Final answer
   x = 1,682.43