Finding the Fourth Proportional to 479,720, 662,071.92 and 278,516

Step by Step Solution

1. Step 1: Write the proportion equation
   479,720 : 662,071.92 = 278,516 : x
2. Step 2: Convert to fraction form
   479,720/662,071.92 = 278,516/x
3. Step 3: Cross multiply
   479,720x = 662,071.92 × 278,516
4. Step 4: Simplify right side
   479,720x = 184,397,622,870.72
5. Step 5: Solve for x
   x = 184,397,622,870.72/479,720
6. Step 6: Final answer
   x = 384,385.94