Finding the Third Proportional to 648,201 and 860,139

Step by Step Solution

1. Step 1: Write the proportion equation
   648,201 : 860,139 = 860,139 : x
2. Step 2: Convert to fraction form
   648,201/860,139 = 860,139/x
3. Step 3: Cross multiply
   648,201x = 860,139 × 860,139
4. Step 4: Simplify right side
   648,201x = 739,839,099,321
5. Step 5: Solve for x
   x = 739,839,099,321/648,201
6. Step 6: Final answer
   x = 1,141,372.97