Finding the Fourth Proportional to 4,925.80, 7,387.89 and 1,638.55

Step by Step Solution

1. Step 1: Write the proportion equation
   4,925.80 : 7,387.89 = 1,638.55 : x
2. Step 2: Convert to fraction form
   4,925.80/7,387.89 = 1,638.55/x
3. Step 3: Cross multiply
   4,925.80x = 7,387.89 × 1,638.55
4. Step 4: Simplify right side
   4,925.80x = 12,105,427.16
5. Step 5: Solve for x
   x = 12,105,427.16/4,925.80
6. Step 6: Final answer
   x = 2,457.56