Finding the Fourth Proportional to 387,978.38, 581,992.17 and 121,749.41

Step by Step Solution

1. Step 1: Write the proportion equation
   387,978.38 : 581,992.17 = 121,749.41 : x
2. Step 2: Convert to fraction form
   387,978.38/581,992.17 = 121,749.41/x
3. Step 3: Cross multiply
   387,978.38x = 581,992.17 × 121,749.41
4. Step 4: Simplify right side
   387,978.38x = 70,857,200,412.16
5. Step 5: Solve for x
   x = 70,857,200,412.16/387,978.38
6. Step 6: Final answer
   x = 182,631.83