Finding the Fourth Proportional to 8,345.79, 12,528.54 and 3,419.37

Step by Step Solution

1. Step 1: Write the proportion equation
   8,345.79 : 12,528.54 = 3,419.37 : x
2. Step 2: Convert to fraction form
   8,345.79/12,528.54 = 3,419.37/x
3. Step 3: Cross multiply
   8,345.79x = 12,528.54 × 3,419.37
4. Step 4: Simplify right side
   8,345.79x = 42,839,713.82
5. Step 5: Solve for x
   x = 42,839,713.82/8,345.79
6. Step 6: Final answer
   x = 5,133.09