Finding the Third Proportional to 508,699 and 787,316.25

Step by Step Solution

1. Step 1: Write the proportion equation
   508,699 : 787,316.25 = 787,316.25 : x
2. Step 2: Convert to fraction form
   508,699/787,316.25 = 787,316.25/x
3. Step 3: Cross multiply
   508,699x = 787,316.25 × 787,316.25
4. Step 4: Simplify right side
   508,699x = 619,866,877,514.06
5. Step 5: Solve for x
   x = 619,866,877,514.06/508,699
6. Step 6: Final answer
   x = 1,218,533.71