Finding the Third Proportional to 87,780.50 and 207,090

Step by Step Solution

1. Step 1: Write the proportion equation
   87,780.50 : 207,090 = 207,090 : x
2. Step 2: Convert to fraction form
   87,780.50/207,090 = 207,090/x
3. Step 3: Cross multiply
   87,780.50x = 207,090 × 207,090
4. Step 4: Simplify right side
   87,780.50x = 42,886,268,100
5. Step 5: Solve for x
   x = 42,886,268,100/87,780.50
6. Step 6: Final answer
   x = 488,562.59