Finding the Fourth Proportional to 7,810.56, 10,790.28 and 5,128.14

Step by Step Solution

1. Step 1: Write the proportion equation
   7,810.56 : 10,790.28 = 5,128.14 : x
2. Step 2: Convert to fraction form
   7,810.56/10,790.28 = 5,128.14/x
3. Step 3: Cross multiply
   7,810.56x = 10,790.28 × 5,128.14
4. Step 4: Simplify right side
   7,810.56x = 55,334,066.48
5. Step 5: Solve for x
   x = 55,334,066.48/7,810.56
6. Step 6: Final answer
   x = 7,084.52