Finding the Fourth Proportional to 9,321.98, 12,864.15 and 5,130.14

Step by Step Solution

1. Step 1: Write the proportion equation
   9,321.98 : 12,864.15 = 5,130.14 : x
2. Step 2: Convert to fraction form
   9,321.98/12,864.15 = 5,130.14/x
3. Step 3: Cross multiply
   9,321.98x = 12,864.15 × 5,130.14
4. Step 4: Simplify right side
   9,321.98x = 65,994,890.48
5. Step 5: Solve for x
   x = 65,994,890.48/9,321.98
6. Step 6: Final answer
   x = 7,079.49