Finding the Fourth Proportional to 428,492, 591,072.72 and 267,269.60

Step by Step Solution

1. Step 1: Write the proportion equation
   428,492 : 591,072.72 = 267,269.60 : x
2. Step 2: Convert to fraction form
   428,492/591,072.72 = 267,269.60/x
3. Step 3: Cross multiply
   428,492x = 591,072.72 × 267,269.60
4. Step 4: Simplify right side
   428,492x = 157,975,769,445.31
5. Step 5: Solve for x
   x = 157,975,769,445.31/428,492
6. Step 6: Final answer
   x = 368,678.46