Finding the Third Proportional to 1,393.50 and 2,158.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.50 : 2,158.88 = 2,158.88 : x
2. Step 2: Convert to fraction form
   1,393.50/2,158.88 = 2,158.88/x
3. Step 3: Cross multiply
   1,393.50x = 2,158.88 × 2,158.88
4. Step 4: Simplify right side
   1,393.50x = 4,660,741.27
5. Step 5: Solve for x
   x = 4,660,741.27/1,393.50
6. Step 6: Final answer
   x = 3,344.63