Finding the Fourth Proportional to 5,385.49, 7,412.72 and 3,810.85

Step by Step Solution

1. Step 1: Write the proportion equation
   5,385.49 : 7,412.72 = 3,810.85 : x
2. Step 2: Convert to fraction form
   5,385.49/7,412.72 = 3,810.85/x
3. Step 3: Cross multiply
   5,385.49x = 7,412.72 × 3,810.85
4. Step 4: Simplify right side
   5,385.49x = 28,248,726.43
5. Step 5: Solve for x
   x = 28,248,726.43/5,385.49
6. Step 6: Final answer
   x = 5,245.34