Finding the Fourth Proportional to 7,928.71, 10,931.67 and 5,091.07

Step by Step Solution

1. Step 1: Write the proportion equation
   7,928.71 : 10,931.67 = 5,091.07 : x
2. Step 2: Convert to fraction form
   7,928.71/10,931.67 = 5,091.07/x
3. Step 3: Cross multiply
   7,928.71x = 10,931.67 × 5,091.07
4. Step 4: Simplify right side
   7,928.71x = 55,653,897.19
5. Step 5: Solve for x
   x = 55,653,897.19/7,928.71
6. Step 6: Final answer
   x = 7,019.29