Finding the Fourth Proportional to 387,978.60, 581,992.50 and 121,749.62

Step by Step Solution

1. Step 1: Write the proportion equation
   387,978.60 : 581,992.50 = 121,749.62 : x
2. Step 2: Convert to fraction form
   387,978.60/581,992.50 = 121,749.62/x
3. Step 3: Cross multiply
   387,978.60x = 581,992.50 × 121,749.62
4. Step 4: Simplify right side
   387,978.60x = 70,857,365,109.10
5. Step 5: Solve for x
   x = 70,857,365,109.10/387,978.60
6. Step 6: Final answer
   x = 182,632.15