Finding the Third Proportional to 257,112 and 553,591.50

Step by Step Solution

1. Step 1: Write the proportion equation
   257,112 : 553,591.50 = 553,591.50 : x
2. Step 2: Convert to fraction form
   257,112/553,591.50 = 553,591.50/x
3. Step 3: Cross multiply
   257,112x = 553,591.50 × 553,591.50
4. Step 4: Simplify right side
   257,112x = 306,463,548,872.25
5. Step 5: Solve for x
   x = 306,463,548,872.25/257,112
6. Step 6: Final answer
   x = 1,191,945.72