Finding the Fourth Proportional to 320,855.50, 442,897.42 and 186,719.50

Step by Step Solution

1. Step 1: Write the proportion equation
   320,855.50 : 442,897.42 = 186,719.50 : x
2. Step 2: Convert to fraction form
   320,855.50/442,897.42 = 186,719.50/x
3. Step 3: Cross multiply
   320,855.50x = 442,897.42 × 186,719.50
4. Step 4: Simplify right side
   320,855.50x = 82,697,584,813.69
5. Step 5: Solve for x
   x = 82,697,584,813.69/320,855.50
6. Step 6: Final answer
   x = 257,740.90