Finding the Fourth Proportional to 13,250.78, 19,876.07 and 3,390.04

Step by Step Solution

1. Step 1: Write the proportion equation
   13,250.78 : 19,876.07 = 3,390.04 : x
2. Step 2: Convert to fraction form
   13,250.78/19,876.07 = 3,390.04/x
3. Step 3: Cross multiply
   13,250.78x = 19,876.07 × 3,390.04
4. Step 4: Simplify right side
   13,250.78x = 67,380,686.59
5. Step 5: Solve for x
   x = 67,380,686.59/13,250.78
6. Step 6: Final answer
   x = 5,085.04