Finding the Fourth Proportional to 2,951.76, 4,428.87 and 1,221.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,951.76 : 4,428.87 = 1,221.60 : x
2. Step 2: Convert to fraction form
   2,951.76/4,428.87 = 1,221.60/x
3. Step 3: Cross multiply
   2,951.76x = 4,428.87 × 1,221.60
4. Step 4: Simplify right side
   2,951.76x = 5,410,307.59
5. Step 5: Solve for x
   x = 5,410,307.59/2,951.76
6. Step 6: Final answer
   x = 1,832.91