Finding the Fourth Proportional to 810,061.31, 1,213,760.60 and 277,291.71

Step by Step Solution

1. Step 1: Write the proportion equation
   810,061.31 : 1,213,760.60 = 277,291.71 : x
2. Step 2: Convert to fraction form
   810,061.31/1,213,760.60 = 277,291.71/x
3. Step 3: Cross multiply
   810,061.31x = 1,213,760.60 × 277,291.71
4. Step 4: Simplify right side
   810,061.31x = 336,565,752,304.63
5. Step 5: Solve for x
   x = 336,565,752,304.63/810,061.31
6. Step 6: Final answer
   x = 415,481.83