Finding the Fourth Proportional to 7,920.10, 10,928.28 and 5,087.98

Step by Step Solution

1. Step 1: Write the proportion equation
   7,920.10 : 10,928.28 = 5,087.98 : x
2. Step 2: Convert to fraction form
   7,920.10/10,928.28 = 5,087.98/x
3. Step 3: Cross multiply
   7,920.10x = 10,928.28 × 5,087.98
4. Step 4: Simplify right side
   7,920.10x = 55,602,870.07
5. Step 5: Solve for x
   x = 55,602,870.07/7,920.10
6. Step 6: Final answer
   x = 7,020.48