Finding the Third Proportional to 31,858.31 and 66,328.88

Step by Step Solution

1. Step 1: Write the proportion equation
   31,858.31 : 66,328.88 = 66,328.88 : x
2. Step 2: Convert to fraction form
   31,858.31/66,328.88 = 66,328.88/x
3. Step 3: Cross multiply
   31,858.31x = 66,328.88 × 66,328.88
4. Step 4: Simplify right side
   31,858.31x = 4,399,519,658.77
5. Step 5: Solve for x
   x = 4,399,519,658.77/31,858.31
6. Step 6: Final answer
   x = 138,096.44