Finding the Fourth Proportional to 3,156.79, 4,355.59 and 1,897.60

Step by Step Solution

1. Step 1: Write the proportion equation
   3,156.79 : 4,355.59 = 1,897.60 : x
2. Step 2: Convert to fraction form
   3,156.79/4,355.59 = 1,897.60/x
3. Step 3: Cross multiply
   3,156.79x = 4,355.59 × 1,897.60
4. Step 4: Simplify right side
   3,156.79x = 8,265,150.55
5. Step 5: Solve for x
   x = 8,265,150.55/3,156.79
6. Step 6: Final answer
   x = 2,618.21