Finding the Fourth Proportional to 3,656.72, 5,475.30 and 1,921.68

Step by Step Solution

1. Step 1: Write the proportion equation
   3,656.72 : 5,475.30 = 1,921.68 : x
2. Step 2: Convert to fraction form
   3,656.72/5,475.30 = 1,921.68/x
3. Step 3: Cross multiply
   3,656.72x = 5,475.30 × 1,921.68
4. Step 4: Simplify right side
   3,656.72x = 10,521,774.50
5. Step 5: Solve for x
   x = 10,521,774.50/3,656.72
6. Step 6: Final answer
   x = 2,877.38