Finding the Fourth Proportional to 7,890.96, 11,830.32 and 5,111.76

Step by Step Solution

1. Step 1: Write the proportion equation
   7,890.96 : 11,830.32 = 5,111.76 : x
2. Step 2: Convert to fraction form
   7,890.96/11,830.32 = 5,111.76/x
3. Step 3: Cross multiply
   7,890.96x = 11,830.32 × 5,111.76
4. Step 4: Simplify right side
   7,890.96x = 60,473,756.56
5. Step 5: Solve for x
   x = 60,473,756.56/7,890.96
6. Step 6: Final answer
   x = 7,663.68