Finding the Third Proportional to 369,128 and 578,295.50

Step by Step Solution

1. Step 1: Write the proportion equation
   369,128 : 578,295.50 = 578,295.50 : x
2. Step 2: Convert to fraction form
   369,128/578,295.50 = 578,295.50/x
3. Step 3: Cross multiply
   369,128x = 578,295.50 × 578,295.50
4. Step 4: Simplify right side
   369,128x = 334,425,685,320.25
5. Step 5: Solve for x
   x = 334,425,685,320.25/369,128
6. Step 6: Final answer
   x = 905,988.40