Finding the Fourth Proportional to 1,656.60, 2,479.50 and 1,217.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,656.60 : 2,479.50 = 1,217.74 : x
2. Step 2: Convert to fraction form
   1,656.60/2,479.50 = 1,217.74/x
3. Step 3: Cross multiply
   1,656.60x = 2,479.50 × 1,217.74
4. Step 4: Simplify right side
   1,656.60x = 3,019,375.56
5. Step 5: Solve for x
   x = 3,019,375.56/1,656.60
6. Step 6: Final answer
   x = 1,822.63