Finding the Fourth Proportional to 7,688.06, 10,602.45 and 5,131.31

Step by Step Solution

1. Step 1: Write the proportion equation
   7,688.06 : 10,602.45 = 5,131.31 : x
2. Step 2: Convert to fraction form
   7,688.06/10,602.45 = 5,131.31/x
3. Step 3: Cross multiply
   7,688.06x = 10,602.45 × 5,131.31
4. Step 4: Simplify right side
   7,688.06x = 54,404,457.71
5. Step 5: Solve for x
   x = 54,404,457.71/7,688.06
6. Step 6: Final answer
   x = 7,076.49