Finding the Fourth Proportional to 5,128.31, 7,688.82 and 2,630.25

Step by Step Solution

1. Step 1: Write the proportion equation
   5,128.31 : 7,688.82 = 2,630.25 : x
2. Step 2: Convert to fraction form
   5,128.31/7,688.82 = 2,630.25/x
3. Step 3: Cross multiply
   5,128.31x = 7,688.82 × 2,630.25
4. Step 4: Simplify right side
   5,128.31x = 20,223,518.81
5. Step 5: Solve for x
   x = 20,223,518.81/5,128.31
6. Step 6: Final answer
   x = 3,943.51