Finding the Fourth Proportional to 11,720.18, 17,581.17 and 3,400.31

Step by Step Solution

1. Step 1: Write the proportion equation
   11,720.18 : 17,581.17 = 3,400.31 : x
2. Step 2: Convert to fraction form
   11,720.18/17,581.17 = 3,400.31/x
3. Step 3: Cross multiply
   11,720.18x = 17,581.17 × 3,400.31
4. Step 4: Simplify right side
   11,720.18x = 59,781,428.16
5. Step 5: Solve for x
   x = 59,781,428.16/11,720.18
6. Step 6: Final answer
   x = 5,100.73