Finding the Fourth Proportional to 387,057.72, 533,513.58 and 288,773.94

Step by Step Solution

1. Step 1: Write the proportion equation
   387,057.72 : 533,513.58 = 288,773.94 : x
2. Step 2: Convert to fraction form
   387,057.72/533,513.58 = 288,773.94/x
3. Step 3: Cross multiply
   387,057.72x = 533,513.58 × 288,773.94
4. Step 4: Simplify right side
   387,057.72x = 154,064,818,540.11
5. Step 5: Solve for x
   x = 154,064,818,540.11/387,057.72
6. Step 6: Final answer
   x = 398,040.94