Finding the Fourth Proportional to 166,987.50, 230,443.56 and 99,919.50

Step by Step Solution

1. Step 1: Write the proportion equation
   166,987.50 : 230,443.56 = 99,919.50 : x
2. Step 2: Convert to fraction form
   166,987.50/230,443.56 = 99,919.50/x
3. Step 3: Cross multiply
   166,987.50x = 230,443.56 × 99,919.50
4. Step 4: Simplify right side
   166,987.50x = 23,025,805,293.42
5. Step 5: Solve for x
   x = 23,025,805,293.42/166,987.50
6. Step 6: Final answer
   x = 137,889.39