Finding the Third Proportional to 216,570.38 and 521,743.50

Step by Step Solution

1. Step 1: Write the proportion equation
   216,570.38 : 521,743.50 = 521,743.50 : x
2. Step 2: Convert to fraction form
   216,570.38/521,743.50 = 521,743.50/x
3. Step 3: Cross multiply
   216,570.38x = 521,743.50 × 521,743.50
4. Step 4: Simplify right side
   216,570.38x = 272,216,279,792.25
5. Step 5: Solve for x
   x = 272,216,279,792.25/216,570.38
6. Step 6: Final answer
   x = 1,256,941.44