Finding the Fourth Proportional to 384,856.56, 531,092.88 and 215,106.48

Step by Step Solution

1. Step 1: Write the proportion equation
   384,856.56 : 531,092.88 = 215,106.48 : x
2. Step 2: Convert to fraction form
   384,856.56/531,092.88 = 215,106.48/x
3. Step 3: Cross multiply
   384,856.56x = 531,092.88 × 215,106.48
4. Step 4: Simplify right side
   384,856.56x = 114,241,519,969.86
5. Step 5: Solve for x
   x = 114,241,519,969.86/384,856.56
6. Step 6: Final answer
   x = 296,841.82