Finding the Fourth Proportional to 8,790.89, 13,188.31 and 2,947.35

Step by Step Solution

1. Step 1: Write the proportion equation
   8,790.89 : 13,188.31 = 2,947.35 : x
2. Step 2: Convert to fraction form
   8,790.89/13,188.31 = 2,947.35/x
3. Step 3: Cross multiply
   8,790.89x = 13,188.31 × 2,947.35
4. Step 4: Simplify right side
   8,790.89x = 38,870,565.48
5. Step 5: Solve for x
   x = 38,870,565.48/8,790.89
6. Step 6: Final answer
   x = 4,421.69