Finding the Third Proportional to 53,439 and 79,870.50

Step by Step Solution

1. Step 1: Write the proportion equation
   53,439 : 79,870.50 = 79,870.50 : x
2. Step 2: Convert to fraction form
   53,439/79,870.50 = 79,870.50/x
3. Step 3: Cross multiply
   53,439x = 79,870.50 × 79,870.50
4. Step 4: Simplify right side
   53,439x = 6,379,296,770.25
5. Step 5: Solve for x
   x = 6,379,296,770.25/53,439
6. Step 6: Final answer
   x = 119,375.30