Finding the Fourth Proportional to 158,978.73, 219,402.85 and 91,017.02

Step by Step Solution

1. Step 1: Write the proportion equation
   158,978.73 : 219,402.85 = 91,017.02 : x
2. Step 2: Convert to fraction form
   158,978.73/219,402.85 = 91,017.02/x
3. Step 3: Cross multiply
   158,978.73x = 219,402.85 × 91,017.02
4. Step 4: Simplify right side
   158,978.73x = 19,969,393,586.51
5. Step 5: Solve for x
   x = 19,969,393,586.51/158,978.73
6. Step 6: Final answer
   x = 125,610.47