Finding the Third Proportional to 643,581 and 874,054.69

Step by Step Solution

1. Step 1: Write the proportion equation
   643,581 : 874,054.69 = 874,054.69 : x
2. Step 2: Convert to fraction form
   643,581/874,054.69 = 874,054.69/x
3. Step 3: Cross multiply
   643,581x = 874,054.69 × 874,054.69
4. Step 4: Simplify right side
   643,581x = 763,971,596,740.72
5. Step 5: Solve for x
   x = 763,971,596,740.72/643,581
6. Step 6: Final answer
   x = 1,187,063.63