Finding the Third Proportional to 87,442.50 and 128,298

Step by Step Solution

1. Step 1: Write the proportion equation
   87,442.50 : 128,298 = 128,298 : x
2. Step 2: Convert to fraction form
   87,442.50/128,298 = 128,298/x
3. Step 3: Cross multiply
   87,442.50x = 128,298 × 128,298
4. Step 4: Simplify right side
   87,442.50x = 16,460,376,804
5. Step 5: Solve for x
   x = 16,460,376,804/87,442.50
6. Step 6: Final answer
   x = 188,242.29