Finding the Fourth Proportional to 281,643, 388,667.34 and 154,323.42

Step by Step Solution

1. Step 1: Write the proportion equation
   281,643 : 388,667.34 = 154,323.42 : x
2. Step 2: Convert to fraction form
   281,643/388,667.34 = 154,323.42/x
3. Step 3: Cross multiply
   281,643x = 388,667.34 × 154,323.42
4. Step 4: Simplify right side
   281,643x = 59,980,473,151.10
5. Step 5: Solve for x
   x = 59,980,473,151.10/281,643
6. Step 6: Final answer
   x = 212,966.32