Finding the Fourth Proportional to 661,055.72, 911,945.76 and 479,369.12

Step by Step Solution

1. Step 1: Write the proportion equation
   661,055.72 : 911,945.76 = 479,369.12 : x
2. Step 2: Convert to fraction form
   661,055.72/911,945.76 = 479,369.12/x
3. Step 3: Cross multiply
   661,055.72x = 911,945.76 × 479,369.12
4. Step 4: Simplify right side
   661,055.72x = 437,158,636,458.93
5. Step 5: Solve for x
   x = 437,158,636,458.93/661,055.72
6. Step 6: Final answer
   x = 661,303.76