Finding the Fourth Proportional to 9,904.86, 13,668.71 and 5,428.76

Step by Step Solution

1. Step 1: Write the proportion equation
   9,904.86 : 13,668.71 = 5,428.76 : x
2. Step 2: Convert to fraction form
   9,904.86/13,668.71 = 5,428.76/x
3. Step 3: Cross multiply
   9,904.86x = 13,668.71 × 5,428.76
4. Step 4: Simplify right side
   9,904.86x = 74,204,050.61
5. Step 5: Solve for x
   x = 74,204,050.61/9,904.86
6. Step 6: Final answer
   x = 7,491.68