Finding the Third Proportional to 369,128.50 and 561,158.50

Step by Step Solution

1. Step 1: Write the proportion equation
   369,128.50 : 561,158.50 = 561,158.50 : x
2. Step 2: Convert to fraction form
   369,128.50/561,158.50 = 561,158.50/x
3. Step 3: Cross multiply
   369,128.50x = 561,158.50 × 561,158.50
4. Step 4: Simplify right side
   369,128.50x = 314,898,862,122.25
5. Step 5: Solve for x
   x = 314,898,862,122.25/369,128.50
6. Step 6: Final answer
   x = 853,087.37