Finding the Fourth Proportional to 1,016.56, 1,402.14 and 623.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.56 : 1,402.14 = 623.74 : x
2. Step 2: Convert to fraction form
   1,016.56/1,402.14 = 623.74/x
3. Step 3: Cross multiply
   1,016.56x = 1,402.14 × 623.74
4. Step 4: Simplify right side
   1,016.56x = 874,570.80
5. Step 5: Solve for x
   x = 874,570.80/1,016.56
6. Step 6: Final answer
   x = 860.32