Finding the Third Proportional to 27,607.50 and 42,990.75

Step by Step Solution

1. Step 1: Write the proportion equation
   27,607.50 : 42,990.75 = 42,990.75 : x
2. Step 2: Convert to fraction form
   27,607.50/42,990.75 = 42,990.75/x
3. Step 3: Cross multiply
   27,607.50x = 42,990.75 × 42,990.75
4. Step 4: Simplify right side
   27,607.50x = 1,848,204,585.56
5. Step 5: Solve for x
   x = 1,848,204,585.56/27,607.50
6. Step 6: Final answer
   x = 66,945.74