Finding the Third Proportional to 90,128 and 130,545

Step by Step Solution

1. Step 1: Write the proportion equation
   90,128 : 130,545 = 130,545 : x
2. Step 2: Convert to fraction form
   90,128/130,545 = 130,545/x
3. Step 3: Cross multiply
   90,128x = 130,545 × 130,545
4. Step 4: Simplify right side
   90,128x = 17,041,997,025
5. Step 5: Solve for x
   x = 17,041,997,025/90,128
6. Step 6: Final answer
   x = 189,086.60