Finding the Third Proportional to 81,870.75 and 123,111

Step by Step Solution

1. Step 1: Write the proportion equation
   81,870.75 : 123,111 = 123,111 : x
2. Step 2: Convert to fraction form
   81,870.75/123,111 = 123,111/x
3. Step 3: Cross multiply
   81,870.75x = 123,111 × 123,111
4. Step 4: Simplify right side
   81,870.75x = 15,156,318,321
5. Step 5: Solve for x
   x = 15,156,318,321/81,870.75
6. Step 6: Final answer
   x = 185,124.95