Finding the Fourth Proportional to 1,210.02, 1,811.72 and 631.68

Step by Step Solution

1. Step 1: Write the proportion equation
   1,210.02 : 1,811.72 = 631.68 : x
2. Step 2: Convert to fraction form
   1,210.02/1,811.72 = 631.68/x
3. Step 3: Cross multiply
   1,210.02x = 1,811.72 × 631.68
4. Step 4: Simplify right side
   1,210.02x = 1,144,427.29
5. Step 5: Solve for x
   x = 1,144,427.29/1,210.02
6. Step 6: Final answer
   x = 945.79