Finding the Fourth Proportional to 13,291.89, 19,934.18 and 3,929.10

Step by Step Solution

1. Step 1: Write the proportion equation
   13,291.89 : 19,934.18 = 3,929.10 : x
2. Step 2: Convert to fraction form
   13,291.89/19,934.18 = 3,929.10/x
3. Step 3: Cross multiply
   13,291.89x = 19,934.18 × 3,929.10
4. Step 4: Simplify right side
   13,291.89x = 78,323,386.64
5. Step 5: Solve for x
   x = 78,323,386.64/13,291.89
6. Step 6: Final answer
   x = 5,892.57