Finding the Fourth Proportional to 151,490.52, 209,057.72 and 86,942.40

Step by Step Solution

1. Step 1: Write the proportion equation
   151,490.52 : 209,057.72 = 86,942.40 : x
2. Step 2: Convert to fraction form
   151,490.52/209,057.72 = 86,942.40/x
3. Step 3: Cross multiply
   151,490.52x = 209,057.72 × 86,942.40
4. Step 4: Simplify right side
   151,490.52x = 18,175,979,915.33
5. Step 5: Solve for x
   x = 18,175,979,915.33/151,490.52
6. Step 6: Final answer
   x = 119,980.97