Finding the Fourth Proportional to 3,870.69, 5,345.59 and 3,200.92

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.69 : 5,345.59 = 3,200.92 : x
2. Step 2: Convert to fraction form
   3,870.69/5,345.59 = 3,200.92/x
3. Step 3: Cross multiply
   3,870.69x = 5,345.59 × 3,200.92
4. Step 4: Simplify right side
   3,870.69x = 17,110,779.21
5. Step 5: Solve for x
   x = 17,110,779.21/3,870.69
6. Step 6: Final answer
   x = 4,420.61