Finding the Third Proportional to 56,478 and 87,499

Step by Step Solution

1. Step 1: Write the proportion equation
   56,478 : 87,499 = 87,499 : x
2. Step 2: Convert to fraction form
   56,478/87,499 = 87,499/x
3. Step 3: Cross multiply
   56,478x = 87,499 × 87,499
4. Step 4: Simplify right side
   56,478x = 7,656,075,001
5. Step 5: Solve for x
   x = 7,656,075,001/56,478
6. Step 6: Final answer
   x = 135,558.54