Finding the Fourth Proportional to 7,812.80, 10,773.48 and 5,156.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,812.80 : 10,773.48 = 5,156.72 : x
2. Step 2: Convert to fraction form
   7,812.80/10,773.48 = 5,156.72/x
3. Step 3: Cross multiply
   7,812.80x = 10,773.48 × 5,156.72
4. Step 4: Simplify right side
   7,812.80x = 55,555,819.79
5. Step 5: Solve for x
   x = 55,555,819.79/7,812.80
6. Step 6: Final answer
   x = 7,110.87