Finding the Fourth Proportional to 7,551.78, 10,409.33 and 5,128.39

Step by Step Solution

1. Step 1: Write the proportion equation
   7,551.78 : 10,409.33 = 5,128.39 : x
2. Step 2: Convert to fraction form
   7,551.78/10,409.33 = 5,128.39/x
3. Step 3: Cross multiply
   7,551.78x = 10,409.33 × 5,128.39
4. Step 4: Simplify right side
   7,551.78x = 53,383,051.83
5. Step 5: Solve for x
   x = 53,383,051.83/7,551.78
6. Step 6: Final answer
   x = 7,068.94