Finding the Third Proportional to 56,340 and 123,840

Step by Step Solution

1. Step 1: Write the proportion equation
   56,340 : 123,840 = 123,840 : x
2. Step 2: Convert to fraction form
   56,340/123,840 = 123,840/x
3. Step 3: Cross multiply
   56,340x = 123,840 × 123,840
4. Step 4: Simplify right side
   56,340x = 15,336,345,600
5. Step 5: Solve for x
   x = 15,336,345,600/56,340
6. Step 6: Final answer
   x = 272,210.61