Finding the Fourth Proportional to 2,157.35, 3,236.00 and 770.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,157.35 : 3,236.00 = 770.31 : x
2. Step 2: Convert to fraction form
   2,157.35/3,236.00 = 770.31/x
3. Step 3: Cross multiply
   2,157.35x = 3,236.00 × 770.31
4. Step 4: Simplify right side
   2,157.35x = 2,492,719.31
5. Step 5: Solve for x
   x = 2,492,719.31/2,157.35
6. Step 6: Final answer
   x = 1,155.46