Finding the Fourth Proportional to 378,081.72, 521,402.18 and 275,945.47

Step by Step Solution

1. Step 1: Write the proportion equation
   378,081.72 : 521,402.18 = 275,945.47 : x
2. Step 2: Convert to fraction form
   378,081.72/521,402.18 = 275,945.47/x
3. Step 3: Cross multiply
   378,081.72x = 521,402.18 × 275,945.47
4. Step 4: Simplify right side
   378,081.72x = 143,878,566,935.89
5. Step 5: Solve for x
   x = 143,878,566,935.89/378,081.72
6. Step 6: Final answer
   x = 380,548.86