Finding the Fourth Proportional to 147,136.31, 203,109.81 and 99,454.25

Step by Step Solution

1. Step 1: Write the proportion equation
   147,136.31 : 203,109.81 = 99,454.25 : x
2. Step 2: Convert to fraction form
   147,136.31/203,109.81 = 99,454.25/x
3. Step 3: Cross multiply
   147,136.31x = 203,109.81 × 99,454.25
4. Step 4: Simplify right side
   147,136.31x = 20,200,132,805.64
5. Step 5: Solve for x
   x = 20,200,132,805.64/147,136.31
6. Step 6: Final answer
   x = 137,288.56