Finding the Fourth Proportional to 278,436.88, 417,561.72 and 100,906.72

Step by Step Solution

1. Step 1: Write the proportion equation
   278,436.88 : 417,561.72 = 100,906.72 : x
2. Step 2: Convert to fraction form
   278,436.88/417,561.72 = 100,906.72/x
3. Step 3: Cross multiply
   278,436.88x = 417,561.72 × 100,906.72
4. Step 4: Simplify right side
   278,436.88x = 42,134,783,562.76
5. Step 5: Solve for x
   x = 42,134,783,562.76/278,436.88
6. Step 6: Final answer
   x = 151,326.16