Finding the Fourth Proportional to 13,978.12, 19,290 and 10,838.56

Step by Step Solution

1. Step 1: Write the proportion equation
   13,978.12 : 19,290 = 10,838.56 : x
2. Step 2: Convert to fraction form
   13,978.12/19,290 = 10,838.56/x
3. Step 3: Cross multiply
   13,978.12x = 19,290 × 10,838.56
4. Step 4: Simplify right side
   13,978.12x = 209,075,822.40
5. Step 5: Solve for x
   x = 209,075,822.40/13,978.12
6. Step 6: Final answer
   x = 14,957.36