Finding the Third Proportional to 59,640 and 87,670.50

Step by Step Solution

1. Step 1: Write the proportion equation
   59,640 : 87,670.50 = 87,670.50 : x
2. Step 2: Convert to fraction form
   59,640/87,670.50 = 87,670.50/x
3. Step 3: Cross multiply
   59,640x = 87,670.50 × 87,670.50
4. Step 4: Simplify right side
   59,640x = 7,686,116,570.25
5. Step 5: Solve for x
   x = 7,686,116,570.25/59,640
6. Step 6: Final answer
   x = 128,875.19