Finding the Fourth Proportional to 1,030.02, 1,421.10 and 631.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,030.02 : 1,421.10 = 631.27 : x
2. Step 2: Convert to fraction form
   1,030.02/1,421.10 = 631.27/x
3. Step 3: Cross multiply
   1,030.02x = 1,421.10 × 631.27
4. Step 4: Simplify right side
   1,030.02x = 897,087.54
5. Step 5: Solve for x
   x = 897,087.54/1,030.02
6. Step 6: Final answer
   x = 870.94