Finding the Third Proportional to 915.56 and 1,405.69

Step by Step Solution

1. Step 1: Write the proportion equation
   915.56 : 1,405.69 = 1,405.69 : x
2. Step 2: Convert to fraction form
   915.56/1,405.69 = 1,405.69/x
3. Step 3: Cross multiply
   915.56x = 1,405.69 × 1,405.69
4. Step 4: Simplify right side
   915.56x = 1,975,957.35
5. Step 5: Solve for x
   x = 1,975,957.35/915.56
6. Step 6: Final answer
   x = 2,158.19