Finding the Third Proportional to 77,139 and 156,424.50

Step by Step Solution

1. Step 1: Write the proportion equation
   77,139 : 156,424.50 = 156,424.50 : x
2. Step 2: Convert to fraction form
   77,139/156,424.50 = 156,424.50/x
3. Step 3: Cross multiply
   77,139x = 156,424.50 × 156,424.50
4. Step 4: Simplify right side
   77,139x = 24,468,624,200.25
5. Step 5: Solve for x
   x = 24,468,624,200.25/77,139
6. Step 6: Final answer
   x = 317,201.73