Finding the Fourth Proportional to 5,116.71, 7,061.55 and 3,128.46

Step by Step Solution

1. Step 1: Write the proportion equation
   5,116.71 : 7,061.55 = 3,128.46 : x
2. Step 2: Convert to fraction form
   5,116.71/7,061.55 = 3,128.46/x
3. Step 3: Cross multiply
   5,116.71x = 7,061.55 × 3,128.46
4. Step 4: Simplify right side
   5,116.71x = 22,091,776.71
5. Step 5: Solve for x
   x = 22,091,776.71/5,116.71
6. Step 6: Final answer
   x = 4,317.57