Finding the Third Proportional to 53,386 and 72,390

Step by Step Solution

1. Step 1: Write the proportion equation
   53,386 : 72,390 = 72,390 : x
2. Step 2: Convert to fraction form
   53,386/72,390 = 72,390/x
3. Step 3: Cross multiply
   53,386x = 72,390 × 72,390
4. Step 4: Simplify right side
   53,386x = 5,240,312,100
5. Step 5: Solve for x
   x = 5,240,312,100/53,386
6. Step 6: Final answer
   x = 98,158.92