Finding the Third Proportional to 187,990.88 and 385,155

Step by Step Solution

1. Step 1: Write the proportion equation
   187,990.88 : 385,155 = 385,155 : x
2. Step 2: Convert to fraction form
   187,990.88/385,155 = 385,155/x
3. Step 3: Cross multiply
   187,990.88x = 385,155 × 385,155
4. Step 4: Simplify right side
   187,990.88x = 148,344,374,025
5. Step 5: Solve for x
   x = 148,344,374,025/187,990.88
6. Step 6: Final answer
   x = 789,104.12