Finding the Third Proportional to 30,805.31 and 66,870.56

Step by Step Solution

1. Step 1: Write the proportion equation
   30,805.31 : 66,870.56 = 66,870.56 : x
2. Step 2: Convert to fraction form
   30,805.31/66,870.56 = 66,870.56/x
3. Step 3: Cross multiply
   30,805.31x = 66,870.56 × 66,870.56
4. Step 4: Simplify right side
   30,805.31x = 4,471,672,129.07
5. Step 5: Solve for x
   x = 4,471,672,129.07/30,805.31
6. Step 6: Final answer
   x = 145,159.12