Finding the Fourth Proportional to 5,421.48, 7,485.72 and 4,792.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,421.48 : 7,485.72 = 4,792.72 : x
2. Step 2: Convert to fraction form
   5,421.48/7,485.72 = 4,792.72/x
3. Step 3: Cross multiply
   5,421.48x = 7,485.72 × 4,792.72
4. Step 4: Simplify right side
   5,421.48x = 35,876,937.31
5. Step 5: Solve for x
   x = 35,876,937.31/5,421.48
6. Step 6: Final answer
   x = 6,617.55