Finding the Third Proportional to 77,990 and 111,528

Step by Step Solution

1. Step 1: Write the proportion equation
   77,990 : 111,528 = 111,528 : x
2. Step 2: Convert to fraction form
   77,990/111,528 = 111,528/x
3. Step 3: Cross multiply
   77,990x = 111,528 × 111,528
4. Step 4: Simplify right side
   77,990x = 12,438,494,784
5. Step 5: Solve for x
   x = 12,438,494,784/77,990
6. Step 6: Final answer
   x = 159,488.33