Finding the Fourth Proportional to 865,870.05, 1,298,947.23 and 266,831.31

Step by Step Solution

1. Step 1: Write the proportion equation
   865,870.05 : 1,298,947.23 = 266,831.31 : x
2. Step 2: Convert to fraction form
   865,870.05/1,298,947.23 = 266,831.31/x
3. Step 3: Cross multiply
   865,870.05x = 1,298,947.23 × 266,831.31
4. Step 4: Simplify right side
   865,870.05x = 346,599,791,001.77
5. Step 5: Solve for x
   x = 346,599,791,001.77/865,870.05
6. Step 6: Final answer
   x = 400,290.77