Finding the Third Proportional to 61,386 and 90,132

Step by Step Solution

1. Step 1: Write the proportion equation
   61,386 : 90,132 = 90,132 : x
2. Step 2: Convert to fraction form
   61,386/90,132 = 90,132/x
3. Step 3: Cross multiply
   61,386x = 90,132 × 90,132
4. Step 4: Simplify right side
   61,386x = 8,123,777,424
5. Step 5: Solve for x
   x = 8,123,777,424/61,386
6. Step 6: Final answer
   x = 132,339.25