Finding the Fourth Proportional to 11,439.55, 17,155.31 and 3,431.93

Step by Step Solution

1. Step 1: Write the proportion equation
   11,439.55 : 17,155.31 = 3,431.93 : x
2. Step 2: Convert to fraction form
   11,439.55/17,155.31 = 3,431.93/x
3. Step 3: Cross multiply
   11,439.55x = 17,155.31 × 3,431.93
4. Step 4: Simplify right side
   11,439.55x = 58,875,857.36
5. Step 5: Solve for x
   x = 58,875,857.36/11,439.55
6. Step 6: Final answer
   x = 5,146.69