Finding the Third Proportional to 77,430 and 109,039.50

Step by Step Solution

1. Step 1: Write the proportion equation
   77,430 : 109,039.50 = 109,039.50 : x
2. Step 2: Convert to fraction form
   77,430/109,039.50 = 109,039.50/x
3. Step 3: Cross multiply
   77,430x = 109,039.50 × 109,039.50
4. Step 4: Simplify right side
   77,430x = 11,889,612,560.25
5. Step 5: Solve for x
   x = 11,889,612,560.25/77,430
6. Step 6: Final answer
   x = 153,553.05