Finding the Fourth Proportional to 3,670.40, 5,478.74 and 3,153.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,670.40 : 5,478.74 = 3,153.72 : x
2. Step 2: Convert to fraction form
   3,670.40/5,478.74 = 3,153.72/x
3. Step 3: Cross multiply
   3,670.40x = 5,478.74 × 3,153.72
4. Step 4: Simplify right side
   3,670.40x = 17,278,411.91
5. Step 5: Solve for x
   x = 17,278,411.91/3,670.40
6. Step 6: Final answer
   x = 4,707.50