Finding the Third Proportional to 564,786 and 860,422.50

Step by Step Solution

1. Step 1: Write the proportion equation
   564,786 : 860,422.50 = 860,422.50 : x
2. Step 2: Convert to fraction form
   564,786/860,422.50 = 860,422.50/x
3. Step 3: Cross multiply
   564,786x = 860,422.50 × 860,422.50
4. Step 4: Simplify right side
   564,786x = 740,326,878,506.25
5. Step 5: Solve for x
   x = 740,326,878,506.25/564,786
6. Step 6: Final answer
   x = 1,310,809.54