Finding the Fourth Proportional to 8,990.86, 12,407.70 and 5,012.18

Step by Step Solution

1. Step 1: Write the proportion equation
   8,990.86 : 12,407.70 = 5,012.18 : x
2. Step 2: Convert to fraction form
   8,990.86/12,407.70 = 5,012.18/x
3. Step 3: Cross multiply
   8,990.86x = 12,407.70 × 5,012.18
4. Step 4: Simplify right side
   8,990.86x = 62,189,625.79
5. Step 5: Solve for x
   x = 62,189,625.79/8,990.86
6. Step 6: Final answer
   x = 6,916.98