Finding the Fourth Proportional to 1,120.81, 1,546.72 and 623.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,120.81 : 1,546.72 = 623.47 : x
2. Step 2: Convert to fraction form
   1,120.81/1,546.72 = 623.47/x
3. Step 3: Cross multiply
   1,120.81x = 1,546.72 × 623.47
4. Step 4: Simplify right side
   1,120.81x = 964,333.52
5. Step 5: Solve for x
   x = 964,333.52/1,120.81
6. Step 6: Final answer
   x = 860.39