Finding the Fourth Proportional to 1,016.52, 1,402.38 and 623.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.52 : 1,402.38 = 623.40 : x
2. Step 2: Convert to fraction form
   1,016.52/1,402.38 = 623.40/x
3. Step 3: Cross multiply
   1,016.52x = 1,402.38 × 623.40
4. Step 4: Simplify right side
   1,016.52x = 874,243.69
5. Step 5: Solve for x
   x = 874,243.69/1,016.52
6. Step 6: Final answer
   x = 860.04