Finding the Third Proportional to 56,278 and 89,115

Step by Step Solution

1. Step 1: Write the proportion equation
   56,278 : 89,115 = 89,115 : x
2. Step 2: Convert to fraction form
   56,278/89,115 = 89,115/x
3. Step 3: Cross multiply
   56,278x = 89,115 × 89,115
4. Step 4: Simplify right side
   56,278x = 7,941,483,225
5. Step 5: Solve for x
   x = 7,941,483,225/56,278
6. Step 6: Final answer
   x = 141,111.68