Finding the Fourth Proportional to 9,123.92, 12,590.63 and 5,145.40

Step by Step Solution

1. Step 1: Write the proportion equation
   9,123.92 : 12,590.63 = 5,145.40 : x
2. Step 2: Convert to fraction form
   9,123.92/12,590.63 = 5,145.40/x
3. Step 3: Cross multiply
   9,123.92x = 12,590.63 × 5,145.40
4. Step 4: Simplify right side
   9,123.92x = 64,783,827.60
5. Step 5: Solve for x
   x = 64,783,827.60/9,123.92
6. Step 6: Final answer
   x = 7,100.44