Finding the Fourth Proportional to 13,019.49, 19,539.77 and 7,400.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,019.49 : 19,539.77 = 7,400.72 : x
2. Step 2: Convert to fraction form
   13,019.49/19,539.77 = 7,400.72/x
3. Step 3: Cross multiply
   13,019.49x = 19,539.77 × 7,400.72
4. Step 4: Simplify right side
   13,019.49x = 144,608,366.63
5. Step 5: Solve for x
   x = 144,608,366.63/13,019.49
6. Step 6: Final answer
   x = 11,107.07