Finding the Third Proportional to 91,386.98 and 200,428.17

Step by Step Solution

1. Step 1: Write the proportion equation
   91,386.98 : 200,428.17 = 200,428.17 : x
2. Step 2: Convert to fraction form
   91,386.98/200,428.17 = 200,428.17/x
3. Step 3: Cross multiply
   91,386.98x = 200,428.17 × 200,428.17
4. Step 4: Simplify right side
   91,386.98x = 40,171,452,081.15
5. Step 5: Solve for x
   x = 40,171,452,081.15/91,386.98
6. Step 6: Final answer
   x = 439,575.20