Finding the Fourth Proportional to 2,216.85, 3,060.69 and 1,378.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,216.85 : 3,060.69 = 1,378.47 : x
2. Step 2: Convert to fraction form
   2,216.85/3,060.69 = 1,378.47/x
3. Step 3: Cross multiply
   2,216.85x = 3,060.69 × 1,378.47
4. Step 4: Simplify right side
   2,216.85x = 4,219,069.34
5. Step 5: Solve for x
   x = 4,219,069.34/2,216.85
6. Step 6: Final answer
   x = 1,903.18