Finding the Fourth Proportional to 28,086.56, 42,129.72 and 7,310

Step by Step Solution

1. Step 1: Write the proportion equation
   28,086.56 : 42,129.72 = 7,310 : x
2. Step 2: Convert to fraction form
   28,086.56/42,129.72 = 7,310/x
3. Step 3: Cross multiply
   28,086.56x = 42,129.72 × 7,310
4. Step 4: Simplify right side
   28,086.56x = 307,968,253.20
5. Step 5: Solve for x
   x = 307,968,253.20/28,086.56
6. Step 6: Final answer
   x = 10,964.97