Finding the Third Proportional to 20,587.50 and 42,070.50

Step by Step Solution

1. Step 1: Write the proportion equation
   20,587.50 : 42,070.50 = 42,070.50 : x
2. Step 2: Convert to fraction form
   20,587.50/42,070.50 = 42,070.50/x
3. Step 3: Cross multiply
   20,587.50x = 42,070.50 × 42,070.50
4. Step 4: Simplify right side
   20,587.50x = 1,769,926,970.25
5. Step 5: Solve for x
   x = 1,769,926,970.25/20,587.50
6. Step 6: Final answer
   x = 85,970.95