Finding the Fourth Proportional to 1,243,117.86, 1,715,016.81 and 699,128.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,243,117.86 : 1,715,016.81 = 699,128.88 : x
2. Step 2: Convert to fraction form
   1,243,117.86/1,715,016.81 = 699,128.88/x
3. Step 3: Cross multiply
   1,243,117.86x = 1,715,016.81 × 699,128.88
4. Step 4: Simplify right side
   1,243,117.86x = 1,199,017,781,556.47
5. Step 5: Solve for x
   x = 1,199,017,781,556.47/1,243,117.86
6. Step 6: Final answer
   x = 964,524.62