Finding the Third Proportional to 31,108.50 and 70,420.50

Step by Step Solution

1. Step 1: Write the proportion equation
   31,108.50 : 70,420.50 = 70,420.50 : x
2. Step 2: Convert to fraction form
   31,108.50/70,420.50 = 70,420.50/x
3. Step 3: Cross multiply
   31,108.50x = 70,420.50 × 70,420.50
4. Step 4: Simplify right side
   31,108.50x = 4,959,046,820.25
5. Step 5: Solve for x
   x = 4,959,046,820.25/31,108.50
6. Step 6: Final answer
   x = 159,411.31