Finding the Fourth Proportional to 3,580.15, 5,369.59 and 947.68

Step by Step Solution

1. Step 1: Write the proportion equation
   3,580.15 : 5,369.59 = 947.68 : x
2. Step 2: Convert to fraction form
   3,580.15/5,369.59 = 947.68/x
3. Step 3: Cross multiply
   3,580.15x = 5,369.59 × 947.68
4. Step 4: Simplify right side
   3,580.15x = 5,088,653.05
5. Step 5: Solve for x
   x = 5,088,653.05/3,580.15
6. Step 6: Final answer
   x = 1,421.35