Finding the Fourth Proportional to 10,885.79, 16,320.45 and 5,618.51

Step by Step Solution

1. Step 1: Write the proportion equation
   10,885.79 : 16,320.45 = 5,618.51 : x
2. Step 2: Convert to fraction form
   10,885.79/16,320.45 = 5,618.51/x
3. Step 3: Cross multiply
   10,885.79x = 16,320.45 × 5,618.51
4. Step 4: Simplify right side
   10,885.79x = 91,696,584.77
5. Step 5: Solve for x
   x = 91,696,584.77/10,885.79
6. Step 6: Final answer
   x = 8,423.52