Finding the Third Proportional to 331,700 and 510,090

Step by Step Solution

1. Step 1: Write the proportion equation
   331,700 : 510,090 = 510,090 : x
2. Step 2: Convert to fraction form
   331,700/510,090 = 510,090/x
3. Step 3: Cross multiply
   331,700x = 510,090 × 510,090
4. Step 4: Simplify right side
   331,700x = 260,191,808,100
5. Step 5: Solve for x
   x = 260,191,808,100/331,700
6. Step 6: Final answer
   x = 784,419.08