Finding the Fourth Proportional to 155,066.78, 213,966.56 and 91,416.87

Step by Step Solution

1. Step 1: Write the proportion equation
   155,066.78 : 213,966.56 = 91,416.87 : x
2. Step 2: Convert to fraction form
   155,066.78/213,966.56 = 91,416.87/x
3. Step 3: Cross multiply
   155,066.78x = 213,966.56 × 91,416.87
4. Step 4: Simplify right side
   155,066.78x = 19,560,152,742.78
5. Step 5: Solve for x
   x = 19,560,152,742.78/155,066.78
6. Step 6: Final answer
   x = 126,140.19