Finding the Third Proportional to 642,438 and 845,005.50

Step by Step Solution

1. Step 1: Write the proportion equation
   642,438 : 845,005.50 = 845,005.50 : x
2. Step 2: Convert to fraction form
   642,438/845,005.50 = 845,005.50/x
3. Step 3: Cross multiply
   642,438x = 845,005.50 × 845,005.50
4. Step 4: Simplify right side
   642,438x = 714,034,295,030.25
5. Step 5: Solve for x
   x = 714,034,295,030.25/642,438
6. Step 6: Final answer
   x = 1,111,444.68