Finding the Third Proportional to 61,505.50 and 78,591.50

Step by Step Solution

1. Step 1: Write the proportion equation
   61,505.50 : 78,591.50 = 78,591.50 : x
2. Step 2: Convert to fraction form
   61,505.50/78,591.50 = 78,591.50/x
3. Step 3: Cross multiply
   61,505.50x = 78,591.50 × 78,591.50
4. Step 4: Simplify right side
   61,505.50x = 6,176,623,872.25
5. Step 5: Solve for x
   x = 6,176,623,872.25/61,505.50
6. Step 6: Final answer
   x = 100,423.93