Finding the Third Proportional to 13,188 and 31,131.75

Step by Step Solution

1. Step 1: Write the proportion equation
   13,188 : 31,131.75 = 31,131.75 : x
2. Step 2: Convert to fraction form
   13,188/31,131.75 = 31,131.75/x
3. Step 3: Cross multiply
   13,188x = 31,131.75 × 31,131.75
4. Step 4: Simplify right side
   13,188x = 969,185,858.06
5. Step 5: Solve for x
   x = 969,185,858.06/13,188
6. Step 6: Final answer
   x = 73,489.98