Finding the Third Proportional to 515,412 and 780,247.50

Step by Step Solution

1. Step 1: Write the proportion equation
   515,412 : 780,247.50 = 780,247.50 : x
2. Step 2: Convert to fraction form
   515,412/780,247.50 = 780,247.50/x
3. Step 3: Cross multiply
   515,412x = 780,247.50 × 780,247.50
4. Step 4: Simplify right side
   515,412x = 608,786,161,256.25
5. Step 5: Solve for x
   x = 608,786,161,256.25/515,412
6. Step 6: Final answer
   x = 1,181,164.12