Finding the Fourth Proportional to 10,004.31, 13,805.90 and 5,528.07

Step by Step Solution

1. Step 1: Write the proportion equation
   10,004.31 : 13,805.90 = 5,528.07 : x
2. Step 2: Convert to fraction form
   10,004.31/13,805.90 = 5,528.07/x
3. Step 3: Cross multiply
   10,004.31x = 13,805.90 × 5,528.07
4. Step 4: Simplify right side
   10,004.31x = 76,319,884.94
5. Step 5: Solve for x
   x = 76,319,884.94/10,004.31
6. Step 6: Final answer
   x = 7,628.70