Finding the Fourth Proportional to 112,419.50, 155,067.56 and 85,502.99

Step by Step Solution

1. Step 1: Write the proportion equation
   112,419.50 : 155,067.56 = 85,502.99 : x
2. Step 2: Convert to fraction form
   112,419.50/155,067.56 = 85,502.99/x
3. Step 3: Cross multiply
   112,419.50x = 155,067.56 × 85,502.99
4. Step 4: Simplify right side
   112,419.50x = 13,258,740,793.75
5. Step 5: Solve for x
   x = 13,258,740,793.75/112,419.50
6. Step 6: Final answer
   x = 117,939.87