Finding the Fourth Proportional to 767,139.98, 1,058,667.09 and 427,571.78

Step by Step Solution

1. Step 1: Write the proportion equation
   767,139.98 : 1,058,667.09 = 427,571.78 : x
2. Step 2: Convert to fraction form
   767,139.98/1,058,667.09 = 427,571.78/x
3. Step 3: Cross multiply
   767,139.98x = 1,058,667.09 × 427,571.78
4. Step 4: Simplify right side
   767,139.98x = 452,656,172,098.72
5. Step 5: Solve for x
   x = 452,656,172,098.72/767,139.98
6. Step 6: Final answer
   x = 590,056.81