Finding the Fourth Proportional to 9,407.87, 12,980.27 and 5,821.10

Step by Step Solution

1. Step 1: Write the proportion equation
   9,407.87 : 12,980.27 = 5,821.10 : x
2. Step 2: Convert to fraction form
   9,407.87/12,980.27 = 5,821.10/x
3. Step 3: Cross multiply
   9,407.87x = 12,980.27 × 5,821.10
4. Step 4: Simplify right side
   9,407.87x = 75,559,420.59
5. Step 5: Solve for x
   x = 75,559,420.59/9,407.87
6. Step 6: Final answer
   x = 8,031.52