Finding the Third Proportional to 13,620.66 and 30,430.69

Step by Step Solution

1. Step 1: Write the proportion equation
   13,620.66 : 30,430.69 = 30,430.69 : x
2. Step 2: Convert to fraction form
   13,620.66/30,430.69 = 30,430.69/x
3. Step 3: Cross multiply
   13,620.66x = 30,430.69 × 30,430.69
4. Step 4: Simplify right side
   13,620.66x = 926,026,741.72
5. Step 5: Solve for x
   x = 926,026,741.72/13,620.66
6. Step 6: Final answer
   x = 67,986.94