Finding the Fourth Proportional to 9,123.36, 12,590.98 and 5,145.30

Step by Step Solution

1. Step 1: Write the proportion equation
   9,123.36 : 12,590.98 = 5,145.30 : x
2. Step 2: Convert to fraction form
   9,123.36/12,590.98 = 5,145.30/x
3. Step 3: Cross multiply
   9,123.36x = 12,590.98 × 5,145.30
4. Step 4: Simplify right side
   9,123.36x = 64,784,369.39
5. Step 5: Solve for x
   x = 64,784,369.39/9,123.36
6. Step 6: Final answer
   x = 7,100.93