Finding the Fourth Proportional to 1,030.82, 1,421.82 and 637.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,030.82 : 1,421.82 = 637.16 : x
2. Step 2: Convert to fraction form
   1,030.82/1,421.82 = 637.16/x
3. Step 3: Cross multiply
   1,030.82x = 1,421.82 × 637.16
4. Step 4: Simplify right side
   1,030.82x = 905,919.72
5. Step 5: Solve for x
   x = 905,919.72/1,030.82
6. Step 6: Final answer
   x = 878.84