Finding the Fourth Proportional to 8,789.15, 12,129.34 and 5,011.70

Step by Step Solution

1. Step 1: Write the proportion equation
   8,789.15 : 12,129.34 = 5,011.70 : x
2. Step 2: Convert to fraction form
   8,789.15/12,129.34 = 5,011.70/x
3. Step 3: Cross multiply
   8,789.15x = 12,129.34 × 5,011.70
4. Step 4: Simplify right side
   8,789.15x = 60,788,613.28
5. Step 5: Solve for x
   x = 60,788,613.28/8,789.15
6. Step 6: Final answer
   x = 6,916.33