Finding the Fourth Proportional to 6,109.60, 8,434.32 and 5,111.20

Step by Step Solution

1. Step 1: Write the proportion equation
   6,109.60 : 8,434.32 = 5,111.20 : x
2. Step 2: Convert to fraction form
   6,109.60/8,434.32 = 5,111.20/x
3. Step 3: Cross multiply
   6,109.60x = 8,434.32 × 5,111.20
4. Step 4: Simplify right side
   6,109.60x = 43,109,496.38
5. Step 5: Solve for x
   x = 43,109,496.38/6,109.60
6. Step 6: Final answer
   x = 7,056.03