Finding the Fourth Proportional to 380,861.67, 525,581.60 and 208,780.01

Step by Step Solution

1. Step 1: Write the proportion equation
   380,861.67 : 525,581.60 = 208,780.01 : x
2. Step 2: Convert to fraction form
   380,861.67/525,581.60 = 208,780.01/x
3. Step 3: Cross multiply
   380,861.67x = 525,581.60 × 208,780.01
4. Step 4: Simplify right side
   380,861.67x = 109,730,930,002.94
5. Step 5: Solve for x
   x = 109,730,930,002.94/380,861.67
6. Step 6: Final answer
   x = 288,112.29