Finding the Third Proportional to 643,584 and 874,060

Step by Step Solution

1. Step 1: Write the proportion equation
   643,584 : 874,060 = 874,060 : x
2. Step 2: Convert to fraction form
   643,584/874,060 = 874,060/x
3. Step 3: Cross multiply
   643,584x = 874,060 × 874,060
4. Step 4: Simplify right side
   643,584x = 763,980,883,600
5. Step 5: Solve for x
   x = 763,980,883,600/643,584
6. Step 6: Final answer
   x = 1,187,072.52