Finding the Fourth Proportional to 1,221,265.89, 1,685,548.71 and 677,576.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,221,265.89 : 1,685,548.71 = 677,576.61 : x
2. Step 2: Convert to fraction form
   1,221,265.89/1,685,548.71 = 677,576.61/x
3. Step 3: Cross multiply
   1,221,265.89x = 1,685,548.71 × 677,576.61
4. Step 4: Simplify right side
   1,221,265.89x = 1,142,088,380,911.67
5. Step 5: Solve for x
   x = 1,142,088,380,911.67/1,221,265.89
6. Step 6: Final answer
   x = 935,167.67