Finding the Fourth Proportional to 2,113.02, 2,915.67 and 1,228.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,113.02 : 2,915.67 = 1,228.62 : x
2. Step 2: Convert to fraction form
   2,113.02/2,915.67 = 1,228.62/x
3. Step 3: Cross multiply
   2,113.02x = 2,915.67 × 1,228.62
4. Step 4: Simplify right side
   2,113.02x = 3,582,250.48
5. Step 5: Solve for x
   x = 3,582,250.48/2,113.02
6. Step 6: Final answer
   x = 1,695.32