Finding the Fourth Proportional to 8,870.39, 13,310.09 and 5,910.86

Step by Step Solution

1. Step 1: Write the proportion equation
   8,870.39 : 13,310.09 = 5,910.86 : x
2. Step 2: Convert to fraction form
   8,870.39/13,310.09 = 5,910.86/x
3. Step 3: Cross multiply
   8,870.39x = 13,310.09 × 5,910.86
4. Step 4: Simplify right side
   8,870.39x = 78,674,026.80
5. Step 5: Solve for x
   x = 78,674,026.80/8,870.39
6. Step 6: Final answer
   x = 8,869.29