Finding the Fourth Proportional to 105,791.30, 158,307.78 and 91,608.60

Step by Step Solution

1. Step 1: Write the proportion equation
   105,791.30 : 158,307.78 = 91,608.60 : x
2. Step 2: Convert to fraction form
   105,791.30/158,307.78 = 91,608.60/x
3. Step 3: Cross multiply
   105,791.30x = 158,307.78 × 91,608.60
4. Step 4: Simplify right side
   105,791.30x = 14,502,354,094.91
5. Step 5: Solve for x
   x = 14,502,354,094.91/105,791.30
6. Step 6: Final answer
   x = 137,084.56