Finding the Fourth Proportional to 661,128.86, 991,111.80 and 262,049.82

Step by Step Solution

1. Step 1: Write the proportion equation
   661,128.86 : 991,111.80 = 262,049.82 : x
2. Step 2: Convert to fraction form
   661,128.86/991,111.80 = 262,049.82/x
3. Step 3: Cross multiply
   661,128.86x = 991,111.80 × 262,049.82
4. Step 4: Simplify right side
   661,128.86x = 259,720,668,789.88
5. Step 5: Solve for x
   x = 259,720,668,789.88/661,128.86
6. Step 6: Final answer
   x = 392,844.25