Finding the Fourth Proportional to 5,659.06, 7,811.10 and 3,980.86

Step by Step Solution

1. Step 1: Write the proportion equation
   5,659.06 : 7,811.10 = 3,980.86 : x
2. Step 2: Convert to fraction form
   5,659.06/7,811.10 = 3,980.86/x
3. Step 3: Cross multiply
   5,659.06x = 7,811.10 × 3,980.86
4. Step 4: Simplify right side
   5,659.06x = 31,094,895.55
5. Step 5: Solve for x
   x = 31,094,895.55/5,659.06
6. Step 6: Final answer
   x = 5,494.71