Finding the Third Proportional to 643,583 and 874,058.50

Step by Step Solution

1. Step 1: Write the proportion equation
   643,583 : 874,058.50 = 874,058.50 : x
2. Step 2: Convert to fraction form
   643,583/874,058.50 = 874,058.50/x
3. Step 3: Cross multiply
   643,583x = 874,058.50 × 874,058.50
4. Step 4: Simplify right side
   643,583x = 763,978,261,422.25
5. Step 5: Solve for x
   x = 763,978,261,422.25/643,583
6. Step 6: Final answer
   x = 1,187,070.29