Finding the Third Proportional to 55,159.50 and 87,390

Step by Step Solution

1. Step 1: Write the proportion equation
   55,159.50 : 87,390 = 87,390 : x
2. Step 2: Convert to fraction form
   55,159.50/87,390 = 87,390/x
3. Step 3: Cross multiply
   55,159.50x = 87,390 × 87,390
4. Step 4: Simplify right side
   55,159.50x = 7,637,012,100
5. Step 5: Solve for x
   x = 7,637,012,100/55,159.50
6. Step 6: Final answer
   x = 138,453.25