Finding the Fourth Proportional to 1,215.91, 1,825.53 and 631.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,215.91 : 1,825.53 = 631.32 : x
2. Step 2: Convert to fraction form
   1,215.91/1,825.53 = 631.32/x
3. Step 3: Cross multiply
   1,215.91x = 1,825.53 × 631.32
4. Step 4: Simplify right side
   1,215.91x = 1,152,493.60
5. Step 5: Solve for x
   x = 1,152,493.60/1,215.91
6. Step 6: Final answer
   x = 947.84