Finding the Fourth Proportional to 1,216.32, 1,679.01 and 902.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,216.32 : 1,679.01 = 902.31 : x
2. Step 2: Convert to fraction form
   1,216.32/1,679.01 = 902.31/x
3. Step 3: Cross multiply
   1,216.32x = 1,679.01 × 902.31
4. Step 4: Simplify right side
   1,216.32x = 1,514,987.51
5. Step 5: Solve for x
   x = 1,514,987.51/1,216.32
6. Step 6: Final answer
   x = 1,245.55