Finding the Fourth Proportional to 387,978.56, 581,992.45 and 121,749.59

Step by Step Solution

1. Step 1: Write the proportion equation
   387,978.56 : 581,992.45 = 121,749.59 : x
2. Step 2: Convert to fraction form
   387,978.56/581,992.45 = 121,749.59/x
3. Step 3: Cross multiply
   387,978.56x = 581,992.45 × 121,749.59
4. Step 4: Simplify right side
   387,978.56x = 70,857,340,047.50
5. Step 5: Solve for x
   x = 70,857,340,047.50/387,978.56
6. Step 6: Final answer
   x = 182,632.10