Finding the Third Proportional to 66,124.50 and 138,711

Step by Step Solution

1. Step 1: Write the proportion equation
   66,124.50 : 138,711 = 138,711 : x
2. Step 2: Convert to fraction form
   66,124.50/138,711 = 138,711/x
3. Step 3: Cross multiply
   66,124.50x = 138,711 × 138,711
4. Step 4: Simplify right side
   66,124.50x = 19,240,741,521
5. Step 5: Solve for x
   x = 19,240,741,521/66,124.50
6. Step 6: Final answer
   x = 290,977.50