Finding the Fourth Proportional to 8,990.29, 12,406.47 and 5,011.30

Step by Step Solution

1. Step 1: Write the proportion equation
   8,990.29 : 12,406.47 = 5,011.30 : x
2. Step 2: Convert to fraction form
   8,990.29/12,406.47 = 5,011.30/x
3. Step 3: Cross multiply
   8,990.29x = 12,406.47 × 5,011.30
4. Step 4: Simplify right side
   8,990.29x = 62,172,539.83
5. Step 5: Solve for x
   x = 62,172,539.83/8,990.29
6. Step 6: Final answer
   x = 6,915.52