Finding the Third Proportional to 31,100.63 and 66,638.81

Step by Step Solution

1. Step 1: Write the proportion equation
   31,100.63 : 66,638.81 = 66,638.81 : x
2. Step 2: Convert to fraction form
   31,100.63/66,638.81 = 66,638.81/x
3. Step 3: Cross multiply
   31,100.63x = 66,638.81 × 66,638.81
4. Step 4: Simplify right side
   31,100.63x = 4,440,731,331.41
5. Step 5: Solve for x
   x = 4,440,731,331.41/31,100.63
6. Step 6: Final answer
   x = 142,785.92