Finding the Third Proportional to 78,643.75 and 109,961.50

Step by Step Solution

1. Step 1: Write the proportion equation
   78,643.75 : 109,961.50 = 109,961.50 : x
2. Step 2: Convert to fraction form
   78,643.75/109,961.50 = 109,961.50/x
3. Step 3: Cross multiply
   78,643.75x = 109,961.50 × 109,961.50
4. Step 4: Simplify right side
   78,643.75x = 12,091,531,482.25
5. Step 5: Solve for x
   x = 12,091,531,482.25/78,643.75
6. Step 6: Final answer
   x = 153,750.70