Finding the Fourth Proportional to 3,680.42, 5,521.46 and 1,215.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,680.42 : 5,521.46 = 1,215.50 : x
2. Step 2: Convert to fraction form
   3,680.42/5,521.46 = 1,215.50/x
3. Step 3: Cross multiply
   3,680.42x = 5,521.46 × 1,215.50
4. Step 4: Simplify right side
   3,680.42x = 6,711,300.95
5. Step 5: Solve for x
   x = 6,711,300.95/3,680.42
6. Step 6: Final answer
   x = 1,823.52