Finding the Fourth Proportional to 9,315.58, 12,855.52 and 5,123.83

Step by Step Solution

1. Step 1: Write the proportion equation
   9,315.58 : 12,855.52 = 5,123.83 : x
2. Step 2: Convert to fraction form
   9,315.58/12,855.52 = 5,123.83/x
3. Step 3: Cross multiply
   9,315.58x = 12,855.52 × 5,123.83
4. Step 4: Simplify right side
   9,315.58x = 65,869,499.04
5. Step 5: Solve for x
   x = 65,869,499.04/9,315.58
6. Step 6: Final answer
   x = 7,070.90