Finding the Fourth Proportional to 138,778.56, 191,388.48 and 91,014.72

Step by Step Solution

1. Step 1: Write the proportion equation
   138,778.56 : 191,388.48 = 91,014.72 : x
2. Step 2: Convert to fraction form
   138,778.56/191,388.48 = 91,014.72/x
3. Step 3: Cross multiply
   138,778.56x = 191,388.48 × 91,014.72
4. Step 4: Simplify right side
   138,778.56x = 17,419,168,918.43
5. Step 5: Solve for x
   x = 17,419,168,918.43/138,778.56
6. Step 6: Final answer
   x = 125,517.72