Finding the Fourth Proportional to 7,815.18, 10,784.98 and 4,278.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,815.18 : 10,784.98 = 4,278.72 : x
2. Step 2: Convert to fraction form
   7,815.18/10,784.98 = 4,278.72/x
3. Step 3: Cross multiply
   7,815.18x = 10,784.98 × 4,278.72
4. Step 4: Simplify right side
   7,815.18x = 46,145,898.93
5. Step 5: Solve for x
   x = 46,145,898.93/7,815.18
6. Step 6: Final answer
   x = 5,904.65