Finding the Fourth Proportional to 19,931.06, 27,503.85 and 10,978.37

Step by Step Solution

1. Step 1: Write the proportion equation
   19,931.06 : 27,503.85 = 10,978.37 : x
2. Step 2: Convert to fraction form
   19,931.06/27,503.85 = 10,978.37/x
3. Step 3: Cross multiply
   19,931.06x = 27,503.85 × 10,978.37
4. Step 4: Simplify right side
   19,931.06x = 301,947,441.72
5. Step 5: Solve for x
   x = 301,947,441.72/19,931.06
6. Step 6: Final answer
   x = 15,149.59