Finding the Third Proportional to 915.05 and 1,978.17

Step by Step Solution

1. Step 1: Write the proportion equation
   915.05 : 1,978.17 = 1,978.17 : x
2. Step 2: Convert to fraction form
   915.05/1,978.17 = 1,978.17/x
3. Step 3: Cross multiply
   915.05x = 1,978.17 × 1,978.17
4. Step 4: Simplify right side
   915.05x = 3,913,163.97
5. Step 5: Solve for x
   x = 3,913,163.97/915.05
6. Step 6: Final answer
   x = 4,276.46