Finding the Fourth Proportional to 5,105.52, 7,045.72 and 3,987.76

Step by Step Solution

1. Step 1: Write the proportion equation
   5,105.52 : 7,045.72 = 3,987.76 : x
2. Step 2: Convert to fraction form
   5,105.52/7,045.72 = 3,987.76/x
3. Step 3: Cross multiply
   5,105.52x = 7,045.72 × 3,987.76
4. Step 4: Simplify right side
   5,105.52x = 28,096,640.39
5. Step 5: Solve for x
   x = 28,096,640.39/5,105.52
6. Step 6: Final answer
   x = 5,503.19