Finding the Third Proportional to 355,311 and 546,689.25

Step by Step Solution

1. Step 1: Write the proportion equation
   355,311 : 546,689.25 = 546,689.25 : x
2. Step 2: Convert to fraction form
   355,311/546,689.25 = 546,689.25/x
3. Step 3: Cross multiply
   355,311x = 546,689.25 × 546,689.25
4. Step 4: Simplify right side
   355,311x = 298,869,136,065.56
5. Step 5: Solve for x
   x = 298,869,136,065.56/355,311
6. Step 6: Final answer
   x = 841,148.00