Finding the Fourth Proportional to 72,978.19, 100,709.91 and 39,444.19

Step by Step Solution

1. Step 1: Write the proportion equation
   72,978.19 : 100,709.91 = 39,444.19 : x
2. Step 2: Convert to fraction form
   72,978.19/100,709.91 = 39,444.19/x
3. Step 3: Cross multiply
   72,978.19x = 100,709.91 × 39,444.19
4. Step 4: Simplify right side
   72,978.19x = 3,972,420,573.15
5. Step 5: Solve for x
   x = 3,972,420,573.15/72,978.19
6. Step 6: Final answer
   x = 54,432.98