Finding the Fourth Proportional to 13,154, 19,734.42 and 3,920

Step by Step Solution

1. Step 1: Write the proportion equation
   13,154 : 19,734.42 = 3,920 : x
2. Step 2: Convert to fraction form
   13,154/19,734.42 = 3,920/x
3. Step 3: Cross multiply
   13,154x = 19,734.42 × 3,920
4. Step 4: Simplify right side
   13,154x = 77,358,926.40
5. Step 5: Solve for x
   x = 77,358,926.40/13,154
6. Step 6: Final answer
   x = 5,881.02