Finding the Fourth Proportional to 1,120.72, 1,546.54 and 623.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,120.72 : 1,546.54 = 623.32 : x
2. Step 2: Convert to fraction form
   1,120.72/1,546.54 = 623.32/x
3. Step 3: Cross multiply
   1,120.72x = 1,546.54 × 623.32
4. Step 4: Simplify right side
   1,120.72x = 963,989.31
5. Step 5: Solve for x
   x = 963,989.31/1,120.72
6. Step 6: Final answer
   x = 860.15