Finding the Fourth Proportional to 8,780.98, 12,117.70 and 5,004.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,780.98 : 12,117.70 = 5,004.31 : x
2. Step 2: Convert to fraction form
   8,780.98/12,117.70 = 5,004.31/x
3. Step 3: Cross multiply
   8,780.98x = 12,117.70 × 5,004.31
4. Step 4: Simplify right side
   8,780.98x = 60,640,727.29
5. Step 5: Solve for x
   x = 60,640,727.29/8,780.98
6. Step 6: Final answer
   x = 6,905.92