Finding the Third Proportional to 42,390 and 64,131

Step by Step Solution

1. Step 1: Write the proportion equation
   42,390 : 64,131 = 64,131 : x
2. Step 2: Convert to fraction form
   42,390/64,131 = 64,131/x
3. Step 3: Cross multiply
   42,390x = 64,131 × 64,131
4. Step 4: Simplify right side
   42,390x = 4,112,785,161
5. Step 5: Solve for x
   x = 4,112,785,161/42,390
6. Step 6: Final answer
   x = 97,022.53