Finding the Third Proportional to 432,139 and 654,172

Step by Step Solution

1. Step 1: Write the proportion equation
   432,139 : 654,172 = 654,172 : x
2. Step 2: Convert to fraction form
   432,139/654,172 = 654,172/x
3. Step 3: Cross multiply
   432,139x = 654,172 × 654,172
4. Step 4: Simplify right side
   432,139x = 427,941,005,584
5. Step 5: Solve for x
   x = 427,941,005,584/432,139
6. Step 6: Final answer
   x = 990,285.55