Finding the Third Proportional to 28,687 and 42,090

Step by Step Solution

1. Step 1: Write the proportion equation
   28,687 : 42,090 = 42,090 : x
2. Step 2: Convert to fraction form
   28,687/42,090 = 42,090/x
3. Step 3: Cross multiply
   28,687x = 42,090 × 42,090
4. Step 4: Simplify right side
   28,687x = 1,771,568,100
5. Step 5: Solve for x
   x = 1,771,568,100/28,687
6. Step 6: Final answer
   x = 61,755.08