Finding the Third Proportional to 503,707.50 and 698,139

Step by Step Solution

1. Step 1: Write the proportion equation
   503,707.50 : 698,139 = 698,139 : x
2. Step 2: Convert to fraction form
   503,707.50/698,139 = 698,139/x
3. Step 3: Cross multiply
   503,707.50x = 698,139 × 698,139
4. Step 4: Simplify right side
   503,707.50x = 487,398,063,321
5. Step 5: Solve for x
   x = 487,398,063,321/503,707.50
6. Step 6: Final answer
   x = 967,621.22