Finding the Fourth Proportional to 13,281.27, 19,918.71 and 3,918.75

Step by Step Solution

1. Step 1: Write the proportion equation
   13,281.27 : 19,918.71 = 3,918.75 : x
2. Step 2: Convert to fraction form
   13,281.27/19,918.71 = 3,918.75/x
3. Step 3: Cross multiply
   13,281.27x = 19,918.71 × 3,918.75
4. Step 4: Simplify right side
   13,281.27x = 78,056,538.18
5. Step 5: Solve for x
   x = 78,056,538.18/13,281.27
6. Step 6: Final answer
   x = 5,877.19