Finding the Third Proportional to 257,017.50 and 553,419

Step by Step Solution

1. Step 1: Write the proportion equation
   257,017.50 : 553,419 = 553,419 : x
2. Step 2: Convert to fraction form
   257,017.50/553,419 = 553,419/x
3. Step 3: Cross multiply
   257,017.50x = 553,419 × 553,419
4. Step 4: Simplify right side
   257,017.50x = 306,272,589,561
5. Step 5: Solve for x
   x = 306,272,589,561/257,017.50
6. Step 6: Final answer
   x = 1,191,641.00