Finding the Fourth Proportional to 1,267,179.20, 1,748,692.72 and 686,391.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,267,179.20 : 1,748,692.72 = 686,391.38 : x
2. Step 2: Convert to fraction form
   1,267,179.20/1,748,692.72 = 686,391.38/x
3. Step 3: Cross multiply
   1,267,179.20x = 1,748,692.72 × 686,391.38
4. Step 4: Simplify right side
   1,267,179.20x = 1,200,287,597,101.33
5. Step 5: Solve for x
   x = 1,200,287,597,101.33/1,267,179.20
6. Step 6: Final answer
   x = 947,212.20