Finding the Third Proportional to 607.88 and 991.50

Step by Step Solution

1. Step 1: Write the proportion equation
   607.88 : 991.50 = 991.50 : x
2. Step 2: Convert to fraction form
   607.88/991.50 = 991.50/x
3. Step 3: Cross multiply
   607.88x = 991.50 × 991.50
4. Step 4: Simplify right side
   607.88x = 983,072.25
5. Step 5: Solve for x
   x = 983,072.25/607.88
6. Step 6: Final answer
   x = 1,617.23