Finding the Fourth Proportional to 1,445.42, 2,167.32 and 578.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.42 : 2,167.32 = 578.72 : x
2. Step 2: Convert to fraction form
   1,445.42/2,167.32 = 578.72/x
3. Step 3: Cross multiply
   1,445.42x = 2,167.32 × 578.72
4. Step 4: Simplify right side
   1,445.42x = 1,254,271.43
5. Step 5: Solve for x
   x = 1,254,271.43/1,445.42
6. Step 6: Final answer
   x = 867.76