Finding the Third Proportional to 402,290 and 607,535.50

Step by Step Solution

1. Step 1: Write the proportion equation
   402,290 : 607,535.50 = 607,535.50 : x
2. Step 2: Convert to fraction form
   402,290/607,535.50 = 607,535.50/x
3. Step 3: Cross multiply
   402,290x = 607,535.50 × 607,535.50
4. Step 4: Simplify right side
   402,290x = 369,099,383,760.25
5. Step 5: Solve for x
   x = 369,099,383,760.25/402,290
6. Step 6: Final answer
   x = 917,495.80