Finding the Fourth Proportional to 91,146.06, 125,742.78 and 57,131.33

Step by Step Solution

1. Step 1: Write the proportion equation
   91,146.06 : 125,742.78 = 57,131.33 : x
2. Step 2: Convert to fraction form
   91,146.06/125,742.78 = 57,131.33/x
3. Step 3: Cross multiply
   91,146.06x = 125,742.78 × 57,131.33
4. Step 4: Simplify right side
   91,146.06x = 7,183,851,630.58
5. Step 5: Solve for x
   x = 7,183,851,630.58/91,146.06
6. Step 6: Final answer
   x = 78,816.92