Finding the Third Proportional to 31,688.72 and 66,430.13

Step by Step Solution

1. Step 1: Write the proportion equation
   31,688.72 : 66,430.13 = 66,430.13 : x
2. Step 2: Convert to fraction form
   31,688.72/66,430.13 = 66,430.13/x
3. Step 3: Cross multiply
   31,688.72x = 66,430.13 × 66,430.13
4. Step 4: Simplify right side
   31,688.72x = 4,412,961,507.52
5. Step 5: Solve for x
   x = 4,412,961,507.52/31,688.72
6. Step 6: Final answer
   x = 139,259.70