Finding the Fourth Proportional to 9,819.31, 13,550.88 and 5,570.66

Step by Step Solution

1. Step 1: Write the proportion equation
   9,819.31 : 13,550.88 = 5,570.66 : x
2. Step 2: Convert to fraction form
   9,819.31/13,550.88 = 5,570.66/x
3. Step 3: Cross multiply
   9,819.31x = 13,550.88 × 5,570.66
4. Step 4: Simplify right side
   9,819.31x = 75,487,345.18
5. Step 5: Solve for x
   x = 75,487,345.18/9,819.31
6. Step 6: Final answer
   x = 7,687.64