Finding the Fourth Proportional to 13,494.30, 18,624.43 and 7,830.81

Step by Step Solution

1. Step 1: Write the proportion equation
   13,494.30 : 18,624.43 = 7,830.81 : x
2. Step 2: Convert to fraction form
   13,494.30/18,624.43 = 7,830.81/x
3. Step 3: Cross multiply
   13,494.30x = 18,624.43 × 7,830.81
4. Step 4: Simplify right side
   13,494.30x = 145,844,382.48
5. Step 5: Solve for x
   x = 145,844,382.48/13,494.30
6. Step 6: Final answer
   x = 10,807.85