Finding the Fourth Proportional to 148,978.20, 205,589.88 and 81,910.20

Step by Step Solution

1. Step 1: Write the proportion equation
   148,978.20 : 205,589.88 = 81,910.20 : x
2. Step 2: Convert to fraction form
   148,978.20/205,589.88 = 81,910.20/x
3. Step 3: Cross multiply
   148,978.20x = 205,589.88 × 81,910.20
4. Step 4: Simplify right side
   148,978.20x = 16,839,908,188.78
5. Step 5: Solve for x
   x = 16,839,908,188.78/148,978.20
6. Step 6: Final answer
   x = 113,036.06