Finding the Fourth Proportional to 9,870.96, 14,809.19 and 5,491.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,870.96 : 14,809.19 = 5,491.50 : x
2. Step 2: Convert to fraction form
   9,870.96/14,809.19 = 5,491.50/x
3. Step 3: Cross multiply
   9,870.96x = 14,809.19 × 5,491.50
4. Step 4: Simplify right side
   9,870.96x = 81,324,666.89
5. Step 5: Solve for x
   x = 81,324,666.89/9,870.96
6. Step 6: Final answer
   x = 8,238.78