Finding the Fourth Proportional to 208,978.79, 288,390.78 and 113,485.46

Step by Step Solution

1. Step 1: Write the proportion equation
   208,978.79 : 288,390.78 = 113,485.46 : x
2. Step 2: Convert to fraction form
   208,978.79/288,390.78 = 113,485.46/x
3. Step 3: Cross multiply
   208,978.79x = 288,390.78 × 113,485.46
4. Step 4: Simplify right side
   208,978.79x = 32,728,158,886.10
5. Step 5: Solve for x
   x = 32,728,158,886.10/208,978.79
6. Step 6: Final answer
   x = 156,609.96