Finding the Third Proportional to 77,410.88 and 128,116.50

Step by Step Solution

1. Step 1: Write the proportion equation
   77,410.88 : 128,116.50 = 128,116.50 : x
2. Step 2: Convert to fraction form
   77,410.88/128,116.50 = 128,116.50/x
3. Step 3: Cross multiply
   77,410.88x = 128,116.50 × 128,116.50
4. Step 4: Simplify right side
   77,410.88x = 16,413,837,572.25
5. Step 5: Solve for x
   x = 16,413,837,572.25/77,410.88
6. Step 6: Final answer
   x = 212,035.29